Posts & Pages: Allow setting a posts page back to a regular page

[momo-ozawa]

Description

• Adds an option for setting a posts page back to a regular page, to match behavior on Calypso
• Fixes actions for a homepage (can't trash a homepage or move it to drafts)

Fix homepage actions	Set post page as reg page

How to test

• Go to the pages list screen
• Verify that a homepage doesn't have the "move to draft" or "move to trash" options
• Verify that a posts page has the "set as regular page" option
• Verify that "set as regular page" works as expected

Regression Notes

1. Potential unintended areas of impact
   pages context menu

2. What I did to test those areas of impact (or what existing automated tests I relied on)
   PageMenuViewModelTests

3. What automated tests I added (or what prevented me from doing so)
   see above

PR submission checklist:

• I have completed the Regression Notes.
• I have considered adding unit tests for my changes.
• I have considered adding accessibility improvements for my changes.
• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

UI Changes testing checklist:

• Portrait and landscape orientations.
• Light and dark modes.
• Fonts: Larger, smaller and bold text.
• High contrast.
• VoiceOver.
• Languages with large words or with letters/accents not frequently used in English.
• Right-to-left languages. (Even if translation isn’t complete, formatting should still respect the right-to-left layout)
• iPhone and iPad.
• Multi-tasking: Split view and Slide over. (iPad)

[wpmobilebot]

📲 You can test the changes from this Pull Request in WordPress Alpha by scanning the QR code below to install the corresponding build.

	App Name	WordPress Alpha
	Configuration	Release-Alpha
	Build Number	pr21963-0bb5b5a
	Version	23.6
	Bundle ID	org.wordpress.alpha
	Commit	0bb5b5a
	App Center Build	WPiOS - One-Offs #7715

Automatticians: You can use our internal self-serve MC tool to give yourself access to App Center if needed.

[wpmobilebot]

📲 You can test the changes from this Pull Request in Jetpack Alpha by scanning the QR code below to install the corresponding build.

	App Name	Jetpack Alpha
	Configuration	Release-Alpha
	Build Number	pr21963-0bb5b5a
	Version	23.6
	Bundle ID	com.jetpack.alpha
	Commit	0bb5b5a
	App Center Build	jetpack-installable-builds #6731

Automatticians: You can use our internal self-serve MC tool to give yourself access to App Center if needed.

[kean]

Tested – worked as expected.