feat: signal per-endpoint diarize to the bridge via Colibri2

[bgrozev]

Propagates a per-participant diarize flag from MUC presence to the videobridge via COLIBRI v2, so diarization can be enabled per endpoint (for multi-speaker endpoints such as room systems and dial-in) instead of only globally.

The client advertises the flag as a <jitsi_participant_diarize> presence element (lib-jitsi-meet participant property). jicofo reads it in ChatRoomMemberImpl.processPresence, threads it through ParticipantAllocationParameters → ParticipantInfo, and emits it as the diarize attribute on the COLIBRI v2 endpoint (create path only; the flag is static per session). Mirrors the existing useSsrcRewriting / supportsPrivateAddresses end-to-end pattern.

Part of a multi-repo change. The four Maven repos share the branch diarization-endpoint-control so CI builds them together; no dependency version bumps are included (they follow after jitsi-xmpp-extensions is released).

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Related PRs (per-endpoint speaker diarization, multi-repo):

• jitsi-meet: feat(transcription): add diarize flag advertised as a participant property jitsi-meet#17614
• jitsi-xmpp-extensions: feat: add diarize attribute to Colibri2Endpoint jitsi-xmpp-extensions#145
• jicoco: feat: add diarize field to mediajson Start event jicoco#238
• jicofo: feat: signal per-endpoint diarize to the bridge via Colibri2 #1291
• jitsi-videobridge: feat: set per-endpoint diarize on the transcriber start event jitsi-videobridge#2431
• opus-transcriber-proxy: feat: per-endpoint diarization via the start event opus-transcriber-proxy#106

[codecov]

Codecov Report

❌ Patch coverage is 10.00000% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 27.06%. Comparing base (db0f7ac) to head (cd4847c).

Files with missing lines	Patch %	Lines
...in/org/jitsi/jicofo/xmpp/muc/ChatRoomMemberImpl.kt	0.00%	4 Missing ⚠️
...tlin/org/jitsi/jicofo/bridge/colibri/Extensions.kt	0.00%	2 Missing ⚠️
...org/jitsi/jicofo/bridge/colibri/ParticipantInfo.kt	0.00%	2 Missing ⚠️
...tsi/jicofo/bridge/colibri/ColibriSessionManager.kt	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1291      +/-   ##
============================================
- Coverage     27.08%   27.06%   -0.03%     
  Complexity      500      500              
============================================
  Files           130      130              
  Lines          8119     8129      +10     
  Branches       1251     1253       +2     
============================================
+ Hits           2199     2200       +1     
- Misses         5589     5598       +9     
  Partials        331      331              

Files with missing lines	Coverage Δ
...i/jicofo/conference/ParticipantInviteRunnable.java	51.26% <100.00%> (+0.31%)	⬆️
...tsi/jicofo/bridge/colibri/ColibriSessionManager.kt	12.50% <0.00%> (-0.41%)	⬇️
...tlin/org/jitsi/jicofo/bridge/colibri/Extensions.kt	0.00% <0.00%> (ø)
...org/jitsi/jicofo/bridge/colibri/ParticipantInfo.kt	0.00% <0.00%> (ø)
...in/org/jitsi/jicofo/xmpp/muc/ChatRoomMemberImpl.kt	0.00% <0.00%> (ø)

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