New: Only scan files that are new or updated (#760)

* New: Only scan files that are new or updated

Pass through filter correctly

Add more tests

Add tests for migration 30

* Fix windows disk provider

* Don't publish deleted event for unmapped file

* Fix test on windows
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Internal Server Error - Gitea: Git with a cup of tea
500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f