FileIDs should not change when datadirectory is moved

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Steps to reproduce

1. Have files stored on a groupfolder shared with other users
2. Move the datadirectory to another location and adjust config.php accordingly

Expected behaviour

Everything should work as before

Actual behaviour

Since the datadirectory changed, the every file inside a groupfolder receives a new fileId. Therefore all metadata (e.g. shares) are lost.

This might not be a groupfolder issue per se, but rather related to https://github.com/nextcloud/server/issues/42581.

CC: @sorbaugh

Server configuration

Nextcloud version: 26.0.9

Group folders version: 14.0.5

Updated from an older Nextcloud/ownCloud or fresh install: Updated from 24

Are you using external storage, if yes which one: local

Are you using encryption: No

Are you using an external user-backend, if yes which one: No

Start by reproducing the issue with files in a shared group folder, then move the datadirectory and update config.php as described. Trace how FileIDs are generated across the move; done means existing files retain their IDs and metadata such as shares remains available.