Fix open locally with files lock and wopi allow list (backport stable26)

[lpranam]

• fix: Add config option to disable edit locally
• fix: Allow to unlock through separate endpoint for edit locally

Fix #3487
Fix #3299

Summary
We add a config value for disabling but also address that unlocking the file was no longer working with a WOPI allow list. We now move this to a separate endpoint to handle any prepare steps we need to do before moving to the local editor.

In a second iteration we can further extend this to update the other views to read only or notify them through Collabora.

Configuration option to disable local editing

occ config:app:set richdocuments open_local_editor --value="no"

• Target version: stable26

backport from #3489

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Documentation (manuals or wiki) has been updated or is not required

[lpranam]

@juliushaertl can you please take on this? 😓

[lpranam]

@juliushaertl ping :)