Move ParentPageSettingsViewController to PostSettingsViewController

[kean]

Fixes #13150

There are multiple pros to this approach:

• You can now create a new page, set a parent, and publish it without ever closing the editor
• Cleaner context menu with fewer rarely used actions (I'd fully remove "Page Attributes" if there is time)
• Much simpler implementation with one less entry point for syncing: we now simply use the existing code from PostSettingsViewController

To test:

Follow these steps to change the parent page:

Screen.Recording.2024-05-01.at.4.15.05.PM.mov

• ✅ Verify that the "Set parent" context menu action was removed from the context menu in the post list

Regression Notes

1. Potential unintended areas of impact: Page Settings

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

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

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.

Testing checklist:

• WordPress.com sites and self-hosted Jetpack sites.
• 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	pr23136-bc6d84e
	Version	24.8
	Bundle ID	org.wordpress.alpha
	Commit	bc6d84e
	App Center Build	WPiOS - One-Offs #9760

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	pr23136-bc6d84e
	Version	24.8
	Bundle ID	com.jetpack.alpha
	Commit	bc6d84e
	App Center Build	jetpack-installable-builds #8806

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

[momo-ozawa]

Works as described