Remove test utils for removed Validator/Defaulter

Author: sbueringer

.golangci.yml

@@ -310,11 +310,6 @@ issues:
     - stylecheck
     path: (framework|e2e)/.*.go
     text: should not use dot imports
-  - linters:
-    - revive
-    - stylecheck
-    path: util/defaulting/defaulting.go
-    text: should not use dot imports
   # Large parts of this file are duplicate from k/k. Let's ignore "emptyStringTest" to reduce the noise in diffs
   # and to avoid making mistakes by diverging from upstream just because of this purely stylistic linter finding.
   - linters: