[Woo POS - payments onboarding] Workaround for the visual glitch when SelectPaymentMethodFragment was visible

[kidinov]

Closes: #12975

Description

The PR makes UI of SelectPaymentMethodFragment invisible after navigation to the next step as during onboarding project the WooPOSCardReader activity is not invisible anymore and as we open the dialog, even if it's pop-uped from the back stack, the UI was still visible

Steps to reproduce

• More -> POS
• Add an item
• Start collecting payments
• Notice that there is visible fragment on the background of the reader connection dialog

The tests that have been performed

The one in the steps to repro

Images/gif

11-25--10-47.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	e2bfefd
	Direct Download	woocommerce-wear-prototype-build-pr12991-e2bfefd.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	e2bfefd
	Direct Download	woocommerce-prototype-build-pr12991-e2bfefd.apk

[dangermattic]

	1 Warning
⚠️	This PR is larger than 300 lines of changes. Please consider splitting it into smaller PRs for easier and faster reviews.

	1 Message
📖	This PR contains changes to RELEASE-NOTES.txt. Note that these changes won't affect the final version of the release notes as this version is in code freeze. Please, get in touch with a release manager if you want to update the final release notes.

Generated by 🚫 Danger

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 39.75%. Comparing base (d3bda7b) to head (e2bfefd).
Report is 9 commits behind head on trunk.

Additional details and impacted files

@@            Coverage Diff            @@
##              trunk   #12991   +/-   ##
=========================================
  Coverage     39.75%   39.75%           
  Complexity     5992     5992           
=========================================
  Files          1268     1268           
  Lines         73262    73262           
  Branches      10046    10046           
=========================================
  Hits          29124    29124           
  Misses        41571    41571           
  Partials       2567     2567           

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