[Woo POS] Hide POS mode for ineligible users

[samiuelson]

Closes: #12189

Description

This PR:

1. Adds the woo_pos remote feature flag
2. Removes woo_pos local feature flag
3. Switches to using the remote feature flag for gating users to the POS entry point in the "More menu" screen

Steps to reproduce

• In debug build variant verify that the "Point of Sale Mode" button is visible without any difference.
• In release build though the "Point of Sale Mode" button should be visible only for the allow-listed emails (e.g. @automattic.com emails).

Testing information

The tests that have been performed

Device: Samsung Galaxy Tab S9, Android 14

1. I tested that "Point of Sale Mode" button is visible without any difference in a debug build variant.
2. I verified that the button is visible for the @automattic.com account in a release build.
3. I verified that the button is not for the [email protected] account in a release build.

• 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	0e8113a
	Direct Download	woocommerce-wear-prototype-build-pr12641-0e8113a.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	0e8113a
	Direct Download	woocommerce-prototype-build-pr12641-0e8113a.apk

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 40.64%. Comparing base (39e1aea) to head (0e8113a).
Report is 43 commits behind head on trunk.

Additional details and impacted files

@@            Coverage Diff            @@
##              trunk   #12641   +/-   ##
=========================================
  Coverage     40.63%   40.64%           
- Complexity     5674     5675    +1     
=========================================
  Files          1230     1229    -1     
  Lines         69166    69162    -4     
  Branches       9579     9578    -1     
=========================================
+ Hits          28105    28110    +5     
+ Misses        38476    38468    -8     
+ Partials       2585     2584    -1     

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[kidinov]

That plus thing was here only because of the local FF, now we can simplify this:

    private fun checkFeaturesAvailability(): Flow<Map<MoreMenuItemButton.Type, MoreMenuItemButton.State>> {
        val initialState = MoreMenuItemButton.Type.entries.associateWith { MoreMenuItemButton.State.Loading }
            .toMutableMap()

        return listOf(
            doCheckAvailability(MoreMenuItemButton.Type.Blaze) { isBlazeEnabled() },
            doCheckAvailability(MoreMenuItemButton.Type.GoogleForWoo) { isGoogleForWooEnabled() },
            doCheckAvailability(MoreMenuItemButton.Type.Inbox) { moreMenuRepository.isInboxEnabled() },
            doCheckAvailability(MoreMenuItemButton.Type.Settings) { moreMenuRepository.isUpgradesEnabled() },
            doCheckAvailability(MoreMenuItemButton.Type.WooPos) { isWooPosEnabled() },
        ).merge()
            .map { update ->
                initialState[update.first] = update.second
                initialState
            }
            .onStart { emit(initialState) }
    }

[kidinov]

LGTM!