Restore functionality fo limit number of players in SS

[DenisTensorWorks]

UE Version:
E.g. UE 5.5

Frontend Version:
E.g. UE5.4

Problem component
Signalling Server

Description
Bring back the player limiting on the Signalling Server.

Additional context
Will need to decide how to set the limits, Whether it's limits per streamer or limits over the entire signalling connection or maybe one limit for every streamer.

[github-actions]

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