[test-only] favorites tests

[ScharfViktor]

related #2454

Test for:

• add file/folder to favorite and delete from favorite in personal space, check propfind contains <oc:favorite>1</oc:favorite>
• add file/folder to favorite and delete from favorite in project space, check propfind contains <oc:favorite>1</oc:favorite>
• add file/folder to favorite in shares

Changes:

• removed all favorites tests using webdav API
• now using Graph API to mark/unmark favorites
• search favorites context kept but need to be updated (will be done in next PRs)

[sonarqubecloud]

Quality Gate failed

Failed conditions
C Reliability Rating on New Code (required ≥ A)

See analysis details on SonarQube Cloud

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