Update golangci-lint to ignore gomock generated files

The regex filter in skip-files is intended to exclude any packages with name containing "gomock*".
This is because the linter config importa specifically excludes package imports that include _.
See [importas analyzer code](https://github.com/julz/importas/blob/e9218386d3f4cd0421d099009f2fdc209269fc22/analyzer.go#L60)

.golangci.yml

@@ -3,6 +3,8 @@ run:
   skip-dirs:
     - vendor/portal
     - vendor
+  skip-files:
+    - '.*\/gomock.*\/.*go$'
   skip-dirs-use-default: true
   modules-download-mode: vendor
   build-tags:
@@ -12,6 +14,9 @@ run:
     - "exclude_graphdriver_btrfs"
   go: "1.18"
 
+output:
+  format: github-actions
+
 issues:
   max-same-issues: 0
   exclude-rules:
@@ -145,6 +150,8 @@ linters-settings:
 
       - pkg: "^github\\.com/Azure/ARO-RP/pkg/api/(v[^/]*[0-9])$"
         alias: $1
+      - pkg: "^github\\.com/Azure/ARO-RP/pkg/util/(v[^/]*[0-9])$"
+        alias: $1
       - pkg: "^github\\.com/Azure/ARO-RP/pkg/client/services/redhatopenshift/mgmt/([0-9]+)-([0-9]+)-([0-9]+)-?(preview)?/redhatopenshift$"
         alias: mgmtredhatopenshift$1$2$3$4
       - pkg: "^github\\.com/Azure/ARO-RP/pkg/(dbtoken|deploy|gateway|mirror|monitor|operator|portal)$"