Grouped product frontend quantity validation added and code refactor

[Mohamed-Asar]

Description (*)

Grouped Product Frontend Quantity validation added

Related Pull Requests

Fixed Issues (if relevant)

1. Grouped Product Frontend Quantity Validations are Missing #39479
2. Magento 2.4.7 minAllowed missing product order qty  #39142

Manual testing scenarios (*)

1.Create a Grouped Product and associate it with child products.
2. Set the following quantity properties for one of the child products:
- Minimum Qty Allowed in Shopping Cart: 2
- Maximum Qty Allowed in Shopping Cart: 10
- Qty Increments: 2
3.Open the Product Detail Page (PDP) of the Grouped Product and test invalid quantities for the selected child product (e.g., 1, 3, or 11) to confirm that invalid inputs are restricted.

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• README.md files for modified modules are updated and included in the pull request if any README.md predefined sections require an update
• All automated tests passed successfully (all builds are green)

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[Mohamed-Asar]

@magento run all tests.

[magento-automated-testing]

Failed to run the builds. Please try to re-run them later.

[Mohamed-Asar]

@magento run all tests