fix(core): Fallback to loading channel at last read date when loadChannelAtMessage fails

[xsahil03x]

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Zendesk: 65188

Description of the pull request

This pull request addresses a bug in the StreamChannel component which now ensures that loading a channel at lastReadMessageId now gracefully handles situations where the channel exceeds the member threshold by falling back to loading at the lastRead date.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.21%. Comparing base (6800319) to head (5569095).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2253   +/-   ##
=======================================
  Coverage   63.21%   63.21%           
=======================================
  Files         402      402           
  Lines       25224    25224           
=======================================
  Hits        15945    15945           
  Misses       9279     9279           

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