chore: update golangci-lint and fix all issues (#3575)

* chore: Update golangci-lint

Signed-off-by: Lars Francke <git@lars-francke.de>

* chore: fix all golangci-lint issues

- Remove deprecated `// +build` tags
- Fix godoclint, modernize, wsl_v5, govet, lll, gci, noctx issues
- Update linter configuration
- Modernize code to use Go 1.22+ features (for range N, slices.Contains, etc.)
- Update make check lint the privileged tests

Signed-off-by: Andrei Aaron <andreifdaaron@gmail.com>

---------

Signed-off-by: Lars Francke <git@lars-francke.de>
Signed-off-by: Andrei Aaron <andreifdaaron@gmail.com>
Co-authored-by: Lars Francke <git@lars-francke.de>

pkg/test/inject/dev.go

@@ -1,5 +1,4 @@
 //go:build dev
-// +build dev
 
 // This file should be linked only in **development** mode.
 
@@ -37,7 +36,7 @@ func Error(err error) error {
 	return nil
 }
 
-// Used to inject error status codes for coverage purposes.
+// ErrStatusCode is used to inject error status codes for coverage purposes.
 // -1 will be returned in case of successful failure injection.
 func ErrStatusCode(status int) int {
 	if !injectedFailure() {

pkg/test/inject/inject_test.go

@@ -1,5 +1,4 @@
 //go:build dev
-// +build dev
 
 // This file should be linked only in **development** mode.
 

pkg/test/inject/prod.go

@@ -1,5 +1,4 @@
 //go:build !dev
-// +build !dev
 
 package inject