Make filesync worker persistant

[JonasMayerDev]

Should Fix #13035

• Tests written, or not not needed

[github-actions]

Codacy

Lint

Type	master	PR
Warnings	63	63
Errors	3	3

SpotBugs

Category	Base	New
Bad practice	63	63
Correctness	63	63
Dodgy code	308	309
Experimental	1	1
Internationalization	7	7
Multithreaded correctness	6	6
Performance	52	52
Security	18	18
Total	518	519

SpotBugs increased!

[github-actions]

APK file: https://www.kaminsky.me/nc-dev/android-artifacts/13217.apk



To test this change/fix you can simply download above APK file and install and test it in parallel to your existing Nextcloud app.

[github-actions]

blue-Light-Screenshot test failed: https://www.kaminsky.me/nc-dev/android-integrationTests/13217-Screenshot-blue-Light-20-51

[JonasMayerDev]

The Idea tested in this PR to remember in the DB when, which files were scanned seems to be unfeasible right now.
The overhead produced when interacting with the DB (adding all files) every time the worker runs adds too much overhead (in my testing, nearly 65% in the best case). Also, trying to interact with the DB in batches did not solve the problem. I will close this PR and try another Idea I had while testing in another PR #13262 to keep it organized and documented.

[github-actions]

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