* Use RimRafMode.UNLINK in tests to avoid filesystem contention (#114024)

* Add `rimrafWithRetries` for tests which incorrectly continue writing to the fixture directory even after the test signals completion

* 💄 No need to pass in RimRafMode.UNLINK since that is the default

* Also retry in case of EPERM

* Add some logging to check if rimraf really fails 5 times

* Fix retry logic

* Improve BackupTracker disposing to avoid fs writes after the test finishes

#109896 Remove IStorageKeysSyncRegistryService and introduce new service for syncing extensions storage

- show only one at a time
- Priority: File > Workspace > Exe

- ignored recommendations service
- recommendations prompt service

Update recommendations for C#.

The C# extension moved to a new publisher ID and the recommendations
need updating.

- do not recommed exe and dynamic workspace recommendations in web