Magento 2 Product Edit/Add admin form custom section

Okay finally I've resolved this by myself here is the full code of my module...

registration.php

<?php

\Magento\Framework\Component\ComponentRegistrar::register(
    \Magento\Framework\Component\ComponentRegistrar::MODULE,
    'Vendor_Module',
    __DIR__
);

etc/module.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../../../../../lib/internal/Magento/Framework/Module/etc/module.xsd">
    <module name="Vendor_Module" setup_version="1.0.0"></module>
</config>

Setup/InstallData.php

<?php

namespace Vendor\Module\Setup;

use Magento\Eav\Setup\EavSetup;
use Magento\Eav\Setup\EavSetupFactory;
use Magento\Framework\Setup\InstallDataInterface;
use Magento\Framework\Setup\ModuleContextInterface;
use Magento\Framework\Setup\ModuleDataSetupInterface;

class InstallData implements InstallDataInterface
{
    private $eavSetupFactory;
    public function __construct(
        EavSetupFactory $eavSetupFactory
    )
    {
        $this->eavSetupFactory = $eavSetupFactory;
    }

    public function install(ModuleDataSetupInterface $setup, ModuleContextInterface $context)
    {
        $eavSetup = $this->eavSetupFactory->create(['setup' => $setup]);
        $eavSetup->addAttribute(
          \Magento\Catalog\Model\Product::ENTITY,
          "testone",
          [
          'group' => "",
          'label' => "Test One",
          'is_html_allowed_on_front' => true,
          'default' => '1',
          'note' => '',
          'global' => \Magento\Catalog\Model\ResourceModel\Eav\Attribute::SCOPE_STORE,
          'visible' => true,
          'required' => false,
          'user_defined' => false,
          'searchable' => false,
          'filterable' => false,
          'comparable' => false,
          'visible_on_front' => true,
          'visible_in_advanced_search' => false,
          'unique' => false,
          "frontend_class" => "",
          "used_in_product_listing" => true,
          "input" => "select",
          "type" => "varchar",
          "source" => "Vendor\Module\Model\Config\Source\TimeSetup",
          'backend' => 'Magento\Eav\Model\Entity\Attribute\Backend\ArrayBackend'
          ]
      );
        $eavSetup->addAttribute(
          \Magento\Catalog\Model\Product::ENTITY,
          "testtwo",
          [
          'group' => "",
          'label' => "Test Two",
          'is_html_allowed_on_front' => true,
          'default' => '1',
          'note' => '',
          'global' => \Magento\Catalog\Model\ResourceModel\Eav\Attribute::SCOPE_STORE,
          'visible' => true,
          'required' => false,
          'user_defined' => false,
          'searchable' => false,
          'filterable' => false,
          'comparable' => false,
          'visible_on_front' => true,
          'visible_in_advanced_search' => false,
          'unique' => false,
          "frontend_class" => "",
          "used_in_product_listing" => true,
          "input" => "select",
          "type" => "varchar",
          "source" => "Vendor\Module\Model\Config\Source\TimeSetup",
          'backend' => 'Magento\Eav\Model\Entity\Attribute\Backend\ArrayBackend'
          ]
      );
    }
}

Model\Config\Source\TimeSetup.php

<?php
namespace Vendor\Module\Model\Config\Source;

class TimeSetup extends \Magento\Eav\Model\Entity\Attribute\Source\AbstractSource
{

    protected $_optionsData;

    /**
     * getAllOptions
     *
     * @return array
     */
    public function getAllOptions()
    {
        if ($this->_options === null) {
            $this->_options = [
                ['value' => 'one', 'label' => __('one')],
                ['value' => 'two', 'label' => __('two')]
            ];
        }
        return $this->_options;
    }
    final public function toOptionArray()
    {
         return array(
            array('value' => 'one', 'label' => __('one')),
            array('value' => 'two', 'label' => __('two'))
         );
     }
}

view/adminhtml/ui_component/product_form.xml

<?xml version="1.0" encoding="UTF-8"?>
<form xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Ui:etc/ui_configuration.xsd">
    <fieldset name="testingproduct">
        <argument name="data" xsi:type="array">
            <item name="config" xsi:type="array">
                <item name="label" xsi:type="string" translate="true">Testing Group</item>
                <item name="provider" xsi:type="string">product</item>
                <item name="dataScope" xsi:type="string">data.product</item>
                <item name="sortOrder" xsi:type="number">2</item>
                <item name="collapsible" xsi:type="boolean">true</item>
                <item name="opened" xsi:type="boolean">false</item>
                <item name="ns" xsi:type="string">product_form</item>
            </item>
        </argument>
        <container name="testing_group">
            <argument name="data" xsi:type="array">
                <item name="type" xsi:type="string">group</item>
                <item name="config" xsi:type="array">
                    <item name="formElement" xsi:type="string">container</item>
                    <item name="component" xsi:type="string">Magento_Ui/js/form/components/group</item>
                    <item name="label" xsi:type="string" translate="true">Testing Group</item>
                    <item name="required" xsi:type="boolean">false</item>
                    <item name="sortOrder" xsi:type="number">220</item>
                    <item name="breakLine" xsi:type="boolean">false</item>
                    <item name="scopeLabel" xsi:type="string">[STORE VIEW]</item>
                </item>
            </argument>
            <field name="testone">
                <argument name="data" xsi:type="array">
                    <item name="options" xsi:type="object">Vendor\Module\Model\Config\Source\TimeSetup</item>
                    <item name="config" xsi:type="array">
                        <item name="label" xsi:type="string" translate="true">Testing Row</item>
                        <item name="sortOrder" xsi:type="number">230</item>
                        <item name="dataType" xsi:type="string">string</item>
                        <item name="formElement" xsi:type="string">select</item>
                    </item>
                </argument>
            </field>
             <field name="testtwo">
                <argument name="data" xsi:type="array">
                    <item name="options" xsi:type="object">Vendor\Module\Model\Config\Source\TimeSetup</item>
                    <item name="config" xsi:type="array">
                        <item name="sortOrder" xsi:type="number">240</item>
                        <item name="dataType" xsi:type="string">string</item>
                        <item name="formElement" xsi:type="string">select</item>
                    </item>
                </argument>
            </field>
        </container>
    </fieldset>
</form>

Using above code, Data saving properly, Only issues I'm facing now is that These attributes are appearing in General section as well in my created custom section which is "Testing Group" so as of now I've hide them from General section using CSS.

From what I see here there is nothing special about your attributes.
They are regular ones.
You can simply add the attributes monday_design_from, monday_design_from and place them in a separate group.
I recommend you do that via code and not manually because I assume you will have logic on these attributes.

Here is an example on how you can do that: https://magento.stackexchange.com/a/162115/146

The only thing you need to change if you want your attributes to appear in a separate section is to add in the configuration array this

'group' => 'Time',