Remove backward compat for source names and multi-stream

[bgrozev]

• ref: Remove backward compatibility with endpoints with no source name support.
• Remove multi stream backward compat code.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (030b8e9) 28.70% compared to head (2816a5c) 28.55%.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1130      +/-   ##
============================================
- Coverage     28.70%   28.55%   -0.15%     
+ Complexity      467      463       -4     
============================================
  Files           128      128              
  Lines          7824     7732      -92     
  Branches       1071     1053      -18     
============================================
- Hits           2246     2208      -38     
+ Misses         5307     5258      -49     
+ Partials        271      266       -5     

Files	Coverage Δ
...tsi/jicofo/bridge/colibri/ColibriSessionManager.kt	0.00% <ø> (ø)
...org/jitsi/jicofo/bridge/colibri/ParticipantInfo.kt	0.00% <ø> (ø)
...tsi/jicofo/conference/JitsiMeetConferenceImpl.java	43.53% <ø> (+0.49%)	⬆️
...i/jicofo/conference/ParticipantInviteRunnable.java	50.31% <ø> (-0.32%)	⬇️
...c/main/kotlin/org/jitsi/jicofo/ConferenceConfig.kt	96.92% <ø> (-0.14%)	⬇️
...o/src/main/kotlin/org/jitsi/jicofo/FocusManager.kt	42.30% <ø> (+0.45%)	⬆️
...n/org/jitsi/jicofo/conference/ConferenceMetrics.kt	94.87% <ø> (-0.69%)	⬇️
.../kotlin/org/jitsi/jicofo/conference/Participant.kt	54.41% <100.00%> (+1.65%)	⬆️
...lin/org/jitsi/jicofo/conference/SourceSignaling.kt	94.73% <100.00%> (+25.98%)	⬆️
...tlin/org/jitsi/jicofo/bridge/colibri/Extensions.kt	0.00% <0.00%> (ø)

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