Merge pull request #21597 from nextcloud/techdebt/noid/return-value-for-commands

apps/dav/lib/Command/CreateAddressBook.php

apps/dav/lib/Command/CreateCalendar.php

apps/dav/lib/Command/ListCalendars.php

apps/dav/lib/Command/MoveCalendar.php

apps/dav/lib/Command/RemoveInvalidShares.php

apps/dav/lib/Command/SendEventReminders.php

apps/dav/lib/Command/SyncBirthdayCalendar.php

apps/dav/lib/Command/SyncSystemAddressBook.php

apps/encryption/lib/Command/DisableMasterKey.php

apps/encryption/lib/Command/EnableMasterKey.php

apps/encryption/lib/Command/RecoverUser.php

apps/federation/lib/Command/SyncFederationAddressBooks.php

apps/files/lib/Command/DeleteOrphanedFiles.php

apps/files/lib/Command/Scan.php

apps/files/lib/Command/ScanAppData.php

apps/files/lib/Command/TransferOwnership.php

apps/files_external/lib/Command/Applicable.php

apps/files_external/lib/Command/Backends.php

apps/files_external/lib/Command/Config.php

apps/files_external/lib/Command/Create.php