feat(recent-search): allow ordering by nc:last_activity when capability is true

[cristianscheid]

• Resolves: #

Summary

• Related to feat(recent-files): add recent_files_limit config on files settings nextcloud/server#58761

• Adds support for <nc:last_activity/> ordering when available as a backend capability, falling back to <d:getlastmodified/> otherwise

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

[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 72.52%. Comparing base (aa20db2) to head (eb5ac70).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/dav/davProperties.ts	66.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1547      +/-   ##
==========================================
- Coverage   72.56%   72.52%   -0.05%     
==========================================
  Files          40       40              
  Lines        1108     1110       +2     
  Branches      271      272       +1     
==========================================
+ Hits          804      805       +1     
  Misses        272      272              
- Partials       32       33       +1     

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[cristianscheid]

/backport to stable3