fix(dav): release part-file lock when an upload fails

[solracsf]

Summary

Directory::createFile() takes a shared lock on the target file and an exclusive lock on the <name>.upload.part path before calling File::put(), but only released them on the success path. If the upload throws or is interrupted, both locks are left behind.

A leftover exclusive part-file lock causes every later upload to the same path to fail with 423 Locked. Because it persists until the request-scoped cleanup runs, or up to the lock TTL (default 1h) if the PHP worker is killed mid-request, one failed upload can block that file for a long time. The web uploader retries 423, so it just keeps hitting the same lock.

This wraps put() in try/finally so the locks are always released.

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

[come-nc]

Looks good. Is that still a draft?

[solracsf]

/backport to stable34

[solracsf]

/backport to stable33

[solracsf]

/backport to stable32