[WOO POS] UI tests for Exit pos dialog

[AnirudhBhat]

Closes: #12689

Description

This PR adds UI tests for Exit POS dialog

Testing information

Ensure the CI is happy - specifically, UI test pipeline is green.

The tests that have been performed

1. Add UI test to verify Exit POS dialog is displayed on exit POS click
2. Add UI test to verify Exit POS dialog is displayed with proper labels
3. Add UI test to verify Exit POS dialog is dismissed on close icon click
4. Add UI test to verify Exit POS dialog is dismissed on Exit button click
5. Add UI test to verify Exit POS Home screen is dismissed on Exit button click

• 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 larger than 300 lines of changes. Please consider splitting it into smaller PRs for easier and faster reviews.

	1 Message
📖	This PR is still a Draft: some checks will be skipped.

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	5d361db
	Direct Download	woocommerce-wear-prototype-build-pr12712-5d361db.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	5d361db
	Direct Download	woocommerce-prototype-build-pr12712-5d361db.apk