feat(talk): Make event attendees Talk room participants

[ChristophWurst]

Fixes #5376

Todo

• Assign participants for new events
• Add new participants for updates of existing events

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.07% ⚠️

Comparison is base (12f5abd) 22.74% compared to head (847504c) 22.67%.
Report is 3 commits behind head on main.

❗ Current head 847504c differs from pull request most recent head 8820948. Consider uploading reports for the commit 8820948 to get more accurate results

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #5380      +/-   ##
============================================
- Coverage     22.74%   22.67%   -0.07%     
  Complexity      372      372              
============================================
  Files           237      237              
  Lines         11684    11719      +35     
  Branches       2270     2278       +8     
============================================
  Hits           2657     2657              
- Misses         9027     9062      +35     

Flag	Coverage Δ
javascript	13.90% <0.00%> (-0.06%)	⬇️
php	65.47% <ø> (ø)

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Files Changed	Coverage Δ
src/services/talkService.js	0.00% <0.00%> (ø)
src/store/calendarObjectInstance.js	0.00% <0.00%> (ø)

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[ChristophWurst]

Works! Ready for review