run golangci-lint run to run gofumpt on various files

[dprotaso]

Unclear why go linter is complaining about this now (#3286)

I ran golangci-lint run --fix

[knative-prow]

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[codecov]

Codecov Report

❌ Patch coverage is 60.00000% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 74.58%. Comparing base (c5e9118) to head (f2c915d).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
webhook/certificates/resources/certs.go	33.33%	2 Missing ⚠️
signals/signal.go	0.00%	1 Missing ⚠️
...ook/resourcesemantics/conversion/internal/types.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3287   +/-   ##
=======================================
  Coverage   74.58%   74.58%           
=======================================
  Files         188      188           
  Lines        8184     8184           
=======================================
  Hits         6104     6104           
  Misses       1840     1840           
  Partials      240      240           

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[nader-ziada]

/lgtm

I'm surprised it didn't complain about these before