fix: add missind interface functions

[tomek2k1]

• Resolves: #

Adds missing interface functions needed by nextcloud/circles#2794

Summary

TODO

• ...

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)
• Labels added where applicable (ex: bug/enhancement, 3. to review, feature component)
• Milestone added for target branch/version (ex: 32.x for stable32)

AI (if applicable)

• The content of this PR was partly or fully generated using AI

[tomek2k1]

/backport to stable35

[artonge]

Linting is happy and it is only interface changes, so merging

[susnux]

This breaks groupfolders, cc @artonge

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