[Woo POS][Cash & Receipts] Add feature flags for both cash and receipts

[kidinov]

Closes: #12997

Description

Adds feature flags for the new features. No functional changes

Images/gif

• 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.

[kidinov]

It looks like they removed and the preview didn't work for tablets

[dangermattic]

	2 Warnings
⚠️	Class WooPosIsCashPaymentsEnabled is missing tests, but unit-tests-exemption label was set to ignore this.
⚠️	Class WooPosIsReceiptsEnabled is missing tests, but unit-tests-exemption label was set to ignore this.

Generated by 🚫 Danger

[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	7428acc
	Direct Download	woocommerce-wear-prototype-build-pr13002-7428acc.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	7428acc
	Direct Download	woocommerce-prototype-build-pr13002-7428acc.apk

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 33.33333% with 4 lines in your changes missing coverage. Please review.

Project coverage is 39.72%. Comparing base (a43313e) to head (7428acc).

Files with missing lines	Patch %	Lines
...woopos/featureflags/WooPosIsCashPaymentsEnabled.kt	0.00%	2 Missing ⚠️
.../ui/woopos/featureflags/WooPosIsReceiptsEnabled.kt	0.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##              trunk   #13002      +/-   ##
============================================
- Coverage     39.72%   39.72%   -0.01%     
  Complexity     6036     6036              
============================================
  Files          1274     1276       +2     
  Lines         73458    73464       +6     
  Branches      10076    10076              
============================================
+ Hits          29181    29183       +2     
- Misses        41701    41705       +4     
  Partials       2576     2576              

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[AnirudhBhat]

LGTM