fix(core): Fix StreamChannelListController not handling notification.channel_deleted event (v9).

[VelikovPetar]

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Linear: FLU-564

Github Issue: #

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• I have signed the Stream CLA (required).
• The code changes follow best practices
• Code changes are tested (add some information if not applicable)

Description of the pull request

Port of #2791 (commit 023687f82) from master to v9.

Adds handling for the notification.channel_deleted event in StreamChannelListController. This fixes the case where a channel is deleted but not watched — the client receives notification.channel_deleted instead of channel.deleted, so the channel was previously not removed from the list.

Also ports the expanded event-handling test suite added in the original PR.

Cherry-picked with manual conflict resolution in CHANGELOG and two refactored test bodies.

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No UI changes.

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Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (v9@95c2b25). Learn more about missing BASE report.

Additional details and impacted files

@@          Coverage Diff          @@
##             v9    #2800   +/-   ##
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  Coverage      ?   66.57%           
=====================================
  Files         ?      429           
  Lines         ?    27093           
  Branches      ?        0           
=====================================
  Hits          ?    18036           
  Misses        ?     9057           
  Partials      ?        0           

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