feat: rename ChannelPaginatorsOrchestrator to ChannelManager

[MartinCupela]

🎯 Goal

depends on GetStream/stream-chat-js#1813

Tracks the stream-chat rename of ChannelPaginatorsOrchestrator to
ChannelManager. No behavioral change on the React side.

BREAKING CHANGE: the prop and the ChatContext field
channelPaginatorsOrchestrator are renamed to channelManager, and the types
ChannelPaginatorsOrchestrator / ChannelPaginatorsOrchestratorState are now
ChannelManager / ChannelManagerState. Every useChatContext() consumer reading
the old field, and any test that builds a partial ChatContext value, has to be
updated. No deprecated prop or type aliases are exported.

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[codecov]

Codecov Report

❌ Patch coverage is 89.47368% with 2 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (release-v15@59b7636). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
...MemberDetailView/ChannelMemberActions.defaults.tsx	0.00%	2 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff               @@
##             release-v15    #3258   +/-   ##
==============================================
  Coverage               ?   84.15%           
==============================================
  Files                  ?      523           
  Lines                  ?    15900           
  Branches               ?     5047           
==============================================
  Hits                   ?    13380           
  Misses                 ?     2520           
  Partials               ?        0           

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