fix(talk): Only invite guest accounts to open Talk conversations

[ChristophWurst]

Inviting guests to a private group chat has the implication that the Talk room has to be opened up for guests. This is unexpected.
This patch adjusts the logic to only invite guest users if the Talk room is already open for guests. Otherwise they are ignored.

Fixes #5687

How to test

Repro steps from #5687

In addition, test it with an open conversation. Guests will be added.

[ChristophWurst]

/backport to stable4.6

[codecov]

Codecov Report

Attention: 11 lines in your changes are missing coverage. Please review.

Comparison is base (073ed63) 24.41% compared to head (e6e8c2a) 24.41%.
Report is 2 commits behind head on main.

Files	Patch %	Lines
src/services/talkService.js	0.00%	11 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #5688   +/-   ##
=========================================
  Coverage     24.41%   24.41%           
  Complexity      418      418           
=========================================
  Files           243      243           
  Lines         10874    10874           
  Branches       1789     1790    +1     
=========================================
  Hits           2655     2655           
  Misses         8219     8219           

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javascript	15.50% <0.00%> (ø)
php	61.63% <ø> (ø)

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[tcitworld]

It's kind of a breaking change though, right? There might be some users which were using this?

[ChristophWurst]

I could first check the room status and if guests are allowed I still send these participants. Only for private rooms I ignore them.

[ChristophWurst]

I could first check the room status and if guests are allowed I still send these participants. Only for private rooms I ignore them.

Done. Please test/review another time

[miaulalala]

Works, the guests are not invited to the room if it isn't open.