fix(files): make files list valid table layout

[ShGKme]

• Resolves: [BITV]: Files list table has invalid HTML layout #41568
• A part of: nextcloud/andy#5

Error: Start tag div seen in table.
Fatal Error: Cannot recover after last error. Any further errors will be ignored.

TODO

• <caption> must be a direct child of <table>, otherwise it doesn't work
  • Moved to the table
  • Created a new prop for caption to not set it manually as a #before content
• <div> for a #before is not allowed as a child of <table>
  • Wrapped the current table content in a new table element and made the current root wrapper a div
• Misc
  • Format files (remove ;)
  • Replace deprecated ::deep with :deep()

Screenshots

Recording.2023-11-17.233217.mp4

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)

[ShGKme]

Still a draft because I'm testing to check if I'm sure that the virtual scrolling is not broken. But ready for review

[susnux]

LGTM at least the "before"-action will be fixed :)

[ShGKme]

@skjnldsv Sorry for the fast merge, we needed it in master until Monday...