chore: Remove redundant in Go 1.22 loop variables

[alexandear]

The PR removes tc := tc in tests and enables copyloopvar to detect such statements in the future. See https://go.dev/blog/loopvar-preview

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.31%. Comparing base (0710d0b) to head (c043e65).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3537   +/-   ##
=======================================
  Coverage   91.31%   91.31%           
=======================================
  Files         184      184           
  Lines       16169    16169           
=======================================
  Hits        14765    14765           
  Misses       1230     1230           
  Partials      174      174           

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[gmlewis]

Thank you, @alexandear!
LGTM.
Merging.