[stable31] fix(files): workspace implementation

[backportbot]

Backport of #7418

Warning, This backport's changes differ from the original and might be incomplete ⚠️

Todo

• Review and resolve any conflicts
• Amend HEAD commit to remove the line stating to skip CI

---

Learn more about backports at https://docs.nextcloud.com/server/stable/go.php?to=developer-backports.

[max-nextcloud]

Blocking so this does not get merged before we're sure it actually makes sense.

[codecov]

Codecov Report

Attention: Patch coverage is 93.54839% with 2 lines in your changes missing coverage. Please review.

Project coverage is 58.46%. Comparing base (4c08ace) to head (4d330d5).
Report is 12 commits behind head on stable31.

Files with missing lines	Patch %	Lines
src/views/RichWorkspace.vue	0.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           stable31    #7421      +/-   ##
============================================
+ Coverage     51.51%   58.46%   +6.94%     
============================================
  Files           290      289       -1     
  Lines         41171    36265    -4906     
  Branches        840      839       -1     
============================================
- Hits          21211    21203       -8     
+ Misses        19840    14943    -4897     
+ Partials        120      119       -1     

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[max-nextcloud]

CI is green again, @skjnldsv approved and I did a sanity check on the code. So should be good to go.