Stop reading/writing channels_channelconnection.retry_count so that it can be dropped

[rowanseymour]

No description provided.

[codecov]

Codecov Report

Merging #483 (6763572) into main (45ab900) will increase coverage by 0.02%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main     #483      +/-   ##
==========================================
+ Coverage   56.82%   56.85%   +0.02%     
==========================================
  Files         123      123              
  Lines        8623     8619       -4     
==========================================
  Hits         4900     4900              
+ Misses       2946     2942       -4     
  Partials      777      777              

Impacted Files	Coverage Δ
core/models/channel_connection.go	23.84% <0.00%> (+0.61%)	⬆️

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