Fix all linter warnings

[dprotaso]

Fixes: #14692

This should unblock PRs that are being gated on the linter checks

Changes are broken down by linter fix

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dprotaso

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[dprotaso]

/assign @skonto

[codecov]

Codecov Report

Attention: Patch coverage is 84.02778% with 23 lines in your changes missing coverage. Please review.

Project coverage is 80.80%. Comparing base (c2f2b8b) to head (86b4390).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
cmd/schema-tweak/overrides.go	0.00%	5 Missing ⚠️
pkg/reconciler/route/route.go	16.66%	5 Missing ⚠️
cmd/activator/main.go	0.00%	2 Missing ⚠️
cmd/schema-tweak/main.go	0.00%	2 Missing ⚠️
pkg/queue/sharedmain/handlers.go	0.00%	2 Missing ⚠️
cmd/default-domain/main.go	0.00%	1 Missing ⚠️
pkg/activator/handler/concurrency_reporter.go	75.00%	1 Missing ⚠️
pkg/activator/net/lb_policy.go	50.00%	1 Missing ⚠️
pkg/autoscaler/statforwarder/leases.go	80.00%	1 Missing ⚠️
pkg/queue/sharedmain/servers.go	0.00%	1 Missing ⚠️
... and 2 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15684      +/-   ##
==========================================
- Coverage   80.81%   80.80%   -0.02%     
==========================================
  Files         222      222              
  Lines       18034    18025       -9     
==========================================
- Hits        14575    14565      -10     
  Misses       3089     3089              
- Partials      370      371       +1     

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[dprotaso]

kourier-tls
/retest