[Woo POS][Non-Simple Products] Remove variation quantity in Products and Variations screen

[AnirudhBhat]

Closes: #13221

Description

This PR removes variation quantity in Products and Variations screen. Since we are filtering some of the variations client side and the variation quantity in the products endpoint includes all the variation. It's error prone to display the exact amount of variation a variable product contains after client side filtering (this filtering happens in the variations screen).

For this reasons, we decided to display "Options available" instead of variation quantity in products screen and remove variation quantity from the toolbar in variations screen.

More context: pdfdoF-62l-p2#comment-7224

Steps to reproduce

Products screen

1. Navigate to POS (More menu -> POS)
2. Ensure you see "Options available" instead of variation quantity on a variable product

Variations screen

1. Navigate to POS (More menu -> POS)
2. Ensure you do not see variation quantity in the toolbar

The tests that have been performed

Tested both the screens on both light and dark mode

Images/gif

variation_quantity_removed.mp4

• I have considered if this change warrants release notes and have added them to RELEASE-NOTES.txt if necessary. Use the "[Internal]" label for non-user-facing changes.

Reviewer (or Author, in the case of optional code reviews):

Please make sure these conditions are met before approving the PR, or request changes if the PR needs improvement:

• The PR is small and has a clear, single focus, or a valid explanation is provided in the description. If needed, please request to split it into smaller PRs.
• Ensure Adequate Unit Test Coverage: The changes are reasonably covered by unit tests or an explanation is provided in the PR description.
• Manual Testing: The author listed all the tests they ran, including smoke tests when needed (e.g., for refactorings). The reviewer confirmed that the PR works as expected on big (tablet) and small (phone) in case of UI changes, and no regressions are added.

[wpmobilebot]

📲 You can test the changes from this Pull Request in WooCommerce-Wear Android by scanning the QR code below to install the corresponding build.

	App Name	WooCommerce-Wear Android
	Platform	⌚️ Wear OS
	Flavor	Jalapeno
	Build Type	Debug
	Commit	3f54acc
	Direct Download	woocommerce-wear-prototype-build-pr13225-3f54acc.apk

[wpmobilebot]

📲 You can test the changes from this Pull Request in WooCommerce Android by scanning the QR code below to install the corresponding build.

	App Name	WooCommerce Android
	Platform	📱 Mobile
	Flavor	Jalapeno
	Build Type	Debug
	Commit	3f54acc
	Direct Download	woocommerce-prototype-build-pr13225-3f54acc.apk

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 40.64%. Comparing base (6f99cb6) to head (3f54acc).
Report is 21 commits behind head on trunk.

Files with missing lines	Patch %	Lines
...ce/android/ui/woopos/home/items/WooPosItemsList.kt	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##              trunk   #13225   +/-   ##
=========================================
  Coverage     40.64%   40.64%           
  Complexity     6380     6380           
=========================================
  Files          1349     1349           
  Lines         77400    77400           
  Branches      10647    10647           
=========================================
  Hits          31461    31461           
  Misses        43159    43159           
  Partials       2780     2780           

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