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.