Improve path resolution in files_version hooks

[artonge]

When the user is logged in and is accessing the file through a public share, the fileinfo will be relative to the public share owner. So we need to resolve the path relative to the owner's root folder.

This PR ensure that we fall back to the owner root folder if the file cannot be found from the current user perspective.

Fix #40090

[artonge]

/backport to stable28

[artonge]

/backport to stable27

[artonge]

/backport to stable26

[backportbot-nextcloud]

The backport to stable26 failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout stable26
git pull origin stable26

# Create the new backport branch
git checkout -b fix/foo-stable26

# Cherry pick the change from the commit sha1 of the change against the default branch
# This might cause conflicts. Resolve them.
git cherry-pick abc123

# Push the cherry pick commit to the remote repository and open a pull request
git push origin fix/foo-stable26

Error: Unknown error

More info at https://docs.nextcloud.com/server/latest/developer_manual/getting_started/development_process.html#manual-backport