run go mod tidy + and drop go.mod|sum files under site/

[dprotaso]

Part of: #5188

1. Ran find . -name "go.mod" -exec bash -c 'cd $(dirname {}); go mod tidy' \;
2. Removed site/ go.* files since there isn't any child go files under that directory tree

[zirain]

find . -name "go.mod" -exec bash -c 'cd $(dirname {}); go mod tidy' \;
this can be part of make go.mod.lint

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.90%. Comparing base (fcc458a) to head (f47b734).
Report is 12 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5191      +/-   ##
==========================================
+ Coverage   66.88%   66.90%   +0.01%     
==========================================
  Files         210      210              
  Lines       32998    32998              
==========================================
+ Hits        22070    22076       +6     
+ Misses       9589     9584       -5     
+ Partials     1339     1338       -1     

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[dprotaso]

Closing in favour of #5199