Update upload service to use work manager

[ravishanker]

Fixes #18714

This PR is an effort update UploadService to user WorkManager in place of current Service. Cause, there are crashes due to foreground operations, and also will not work when migrated to Android 14

It is work in progress

• UploadService is decomposed into two workers; UploadPostWorker, and UploadMediaWorker

TO-DO

• Integrate this wherever UploadService is used
• Test it thoroughly all Post, and Media upload scenarios
• Delete UploadService

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To Test:

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Regression Notes

1. Potential unintended areas of impact

   • TODO

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

   • TODO

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

   • TODO

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PR Submission Checklist:

• I have completed the Regression Notes.
• 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.

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UI Changes Testing Checklist:

• Portrait and landscape orientations.
• Light and dark modes.
• Fonts: Larger, smaller and bold text.
• High contrast.
• Talkback.
• 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)
• Large and small screen sizes. (Tablet and smaller phones)
• Multi-tasking: Split screen and Pop-up view. (Android 10 or higher)

[peril-wordpress-mobile]

	Warnings
⚠️	PR has more than 300 lines of code changing. Consider splitting into smaller PRs if possible.

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[wpmobilebot]

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	Commit	8e38e4a
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[wpmobilebot]

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

	App Name	WordPress
	Flavor	Jalapeno
	Build Type	Debug
	Version	pr19755-8e38e4a
	Commit	8e38e4a
	Direct Download	wordpress-prototype-build-pr19755-8e38e4a.apk

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[oguzkocer]

We are slowly stepping away from FluxC which this PR depends, and considering the PR hasn't been updated in a long time, I think it's best to close and re-visit if necessary.