Posts & Pages: Add "deleting..." state

[kean]

• Move deletion and restoration to PostCoordinator
• Remove the alert after tapping “Undo”: the post will simply appear where it was, which is enough
• Fix an issue with SiteSettings view controller displayed in the prompt of 403 not having a “Done” button

Notes:

• Permanent deletion is currently optimistically deletes the post (production behavior)
• Pages don't have a respective status label

To test:

Follow the steps from the video:

Simulator.Screen.Recording.-.iPhone.15.-.2023-10-27.at.16.40.29.mp4

Regression Notes

1. Potential unintended areas of impact: Posts
2. What I did to test those areas of impact (or what existing automated tests I relied on): manual
3. What automated tests I added (or what prevented me from doing so): n/a

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)

[peril-wordpress-mobile]

	Warnings
⚠️	PR is not assigned to a milestone.

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📲 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
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	Build Number	pr21907-a2bd951
	Version	23.5
	Bundle ID	com.jetpack.alpha
	Commit	a2bd951
	App Center Build	jetpack-installable-builds #6633

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[momo-ozawa]

@kean Nice improvements!

Restored post always shows up in drafts

This is the behavior on production as well. A post restored via the "Undo" action is always restored as a draft.

If we remove the alert, let's make sure to restore the posts in the original status / tab. Not sure if this is possible though - in which case we may have to keep the undo alert.

Simulator.Screen.Recording.-.iPhone.15.Pro.-.2023-10-30.at.11.05.15.mp4

Footer cell w activity indicator becomes visible when post is trashed

After trashing a post, the footer cell becomes visible, and doesn't go away even after the post has been trashed.

I don't think we need to show the footer cell when deleting a post - wdyt?

Simulator.Screen.Recording.-.iPhone.15.Pro.-.2023-10-30.at.10.20.15.mp4

[kean]

I removed the "Undo" button as discussed in Slack p1698763051200289-slack-C04SFL0RP51 and added the footer bug, which I think is a regression introduced in one of the previous PRs, to #21900.

I also unintentionally merged #21913 in this PR, which was already approved.