Offline Mode: Draft sync states

[momo-ozawa]

Part of #22578

Description

• Adds new "sync states" for draft post cells (idle, syncing, offline changes, failed)
• Removing the status label will be addressed in a future PR (https://github.com/wordpress-mobile/WordPress-iOS/pull/22648)

How to test

• Open a draft
• Verify the following conditions based on the state

State	Activity indicator?	Icon?	Ellipsis button?
Idle (Successfully uploaded)	No	No	Yes
Syncing (Uploading, trashing)	Yes	No	No
Offline changes (No internet connection)	No	Yes	Yes
Failed (Other errors)	No	Yes	Yes

Regression Notes

1. Potential unintended areas of impact Post cell

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

3. What automated tests I added (or what prevented me from doing so) Added tests for the view model

PR submission checklist:

• [x] I have completed the Regression Notes.
• [x] I have considered adding unit tests for my changes.
• [x] 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
:warning:	View files have been modified, but no screenshot or video is included in the pull request. Consider adding some for clarity.

Generated by :no_entry_sign: Danger

[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	pr22634-4e23acb
	Version	24.4
	Bundle ID	org.wordpress.alpha
	Commit	4e23acb07d4661277df8981fc321d7baa9a2c71e
	App Center Build	WPiOS - One-Offs #9082

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	pr22634-4e23acb
	Version	24.4
	Bundle ID	com.jetpack.alpha
	Commit	4e23acb07d4661277df8981fc321d7baa9a2c71e
	App Center Build	jetpack-installable-builds #8125

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

[kean]

One issue to note: when there are offline changes and you re-enable the connection, the post don't actually get updated immediately.