Allow permanently deleting locally trashed drafts from the previous version of the app

[kean]

Fixes https://a8c.sentry.io/issues/5343807162/events/d9422391fc1247aba28b75b8fab16fb9/

To test:

Before testing: disable the assertion in PostRepository._delete on line 337

• Turn network connectivity off
• Disable the "Syncronous Publishing" FF
• Open "Post List" / "Drafts"
• Create and save a new draft
• Tap "More" / "Trash" and confirm trashing
• Enable the "Syncronous Publishing" FF
• Restart the app
• Open "Post List" / "Drafts" (the post will still be there)
• Tap "More" / "Delete" (note: yes, it thinks it's in trash)
• Verify that the post got deleted

Regression Notes

1. Potential unintended areas of impact: Post List

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)

[dangermattic]

	1 Warning
⚠️	This PR is assigned to the milestone 24.9 ❄️. The due date for this milestone has already passed. Please assign it to a milestone with a later deadline or check whether the release for this milestone has already been finished.

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📲 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	pr23237-6b93f89
	Version	24.9
	Bundle ID	org.wordpress.alpha
	Commit	6b93f89
	App Center Build	WPiOS - One-Offs #9952

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[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	pr23237-6b93f89
	Version	24.9
	Bundle ID	com.jetpack.alpha
	Commit	6b93f89
	App Center Build	jetpack-installable-builds #9002

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