'Skip device preview before joining a call' should join calls with camera disabled

[Antreesy]

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Feature request

• Ref [Bug]: #direct-call param does not respect 'Skip device preview before joining a call' #17471

From the original discussion, there was a concern raised, that 'Skip device preview before joining a call' together with direct-call, but also on any accidental / swift clicking on 'Join call' may expose the user straight after joining, when he's not realised it yet (even worse, if device/app freezes, but the first frame was already sent to others). There is no chance to prevent disabling camera

Describe the solution you'd like

• Always mute camera on joining call, when this flag is disabled
• Add a description to the toggle in Admin settings

Alternatives:

• one more toggle, default-on for camera on + device skip, mutually exclusive with 'Turn camera and microphone off by default'
• option to predefine the type of 'call' with #direct-call parameter - E.g. join with audio only / with audio+video