Improve HPB warning scenarios

[nickvergessen]

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• Warn in all calls if HPB is not present (the 4 person warning atm seems to have disappeared?)
• Warn in admin settings and setupcheck about incomplete setup if HPB is not present

Warning

Nextcloud Talk setup not complete

Install the High Performance Backend to ensure calls with multiple people work seamlessly.

[Antreesy]

• Warn in admin settings and setupcheck about incomplete setup if HPB is not present

In which place?

• Warn in all calls if HPB is not present (the 4 person warning atm seems to have disappeared?)

Don't see it in the code, will try to restore

[nickvergessen]

-Warn in admin settings and setupcheck about incomplete setup if HPB is not present

In which place?

I will take care of that part for now and ping you later if needed

[nimishavijay]

Great idea! We should also add a call to action button in the note card as an obvious next step, possibly with a link to the relevant documentation or something else that would help the set up process

[nickvergessen]

Frontend Call Warning history

• Added Show a warning with many users without external signaling #1649
• Simplified Less pushy warning #1653
• Moved from signaling to application in Move things that should not be there outside of signaling object #1821
• isNoMcuWarningEnabled is defined but unused after the vue rewrite in stable18

[Antreesy]

From PR discussion (QualityWarningTooltip):

• we can use an icon in the call view, I'd even say use the same connection icon entry, just add another block of text in the popover?

[nickvergessen]

• Setup warning in Warn the admin when no High-performance backend is set up #14063
  
  
• Sidebar warning during a call in fix(signaling): add UI warning in call with 2+ participants #14022