fix(preview): delete version metadata by preview ID

[joshtrichards]

• Resolves: #

Summary

Delete version metadata using the specific preview_versions row referenced by the preview.

insert() creates one preview_versions row whose ID is the preview ID, and stores that ID in previews.version_id. The delete() query should therefore use version_id rather than (file_id, version), which can match multiple previews (i.e. different dimensions) for the same file version.

Previously, deleting one preview could remove the preview_versions rows belonging to other previews of the same file version.

Changes:

• Read the preview's version_id.
• Delete the corresponding row from preview_versions by its id.
• Preserve the existing handling for non-versioned previews, whose persisted version_id is -1

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

[joshtrichards]

/backport to stable34

[joshtrichards]

/backport to stable33