[Woo POS - payments onboarding] Remove local FF

[kidinov]

Closes: #12928

Description

The PR removes feature flag

Testing information

• Use both release and debug builds
• Use site with unfinished onboarding
• More -> Payments
• Notice that POS is available for both builds
• Notice that onboarding is shown on the both builds

The tests that have been performed

Above

Images/gif

11-18--16-35.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.

[dangermattic]

	1 Warning
⚠️	This PR is assigned to the milestone 21.2. This milestone is due in less than 2 days. Please make sure to get it merged by then or assign it to a milestone with a later deadline.

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	503f98d
	Direct Download	woocommerce-wear-prototype-build-pr12942-503f98d.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	503f98d
	Direct Download	woocommerce-prototype-build-pr12942-503f98d.apk

[AnirudhBhat]

Thanks for working on this @kidinov. LGTM I'll merge this after I review the base PR.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 39.73%. Comparing base (81b12c9) to head (503f98d).
Report is 12 commits behind head on trunk.

Files with missing lines	Patch %	Lines
...m/woocommerce/android/ui/woopos/WooPosIsEnabled.kt	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##              trunk   #12942      +/-   ##
============================================
- Coverage     39.73%   39.73%   -0.01%     
+ Complexity     5985     5983       -2     
============================================
  Files          1268     1267       -1     
  Lines         73252    73222      -30     
  Branches      10061    10041      -20     
============================================
- Hits          29106    29094      -12     
+ Misses        41564    41562       -2     
+ Partials       2582     2566      -16     

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