Disable muzzle in gitlab (#8475)

Author: randomanderson

.gitlab-ci.yml

@@ -148,6 +148,8 @@ muzzle:
   needs: [ build ]
   stage: tests
   parallel: 8
+  rules:
+    - when: never
   variables:
     BUILD_CACHE_TYPE: test
   script:
@@ -250,10 +252,14 @@ agent_integration_tests:
 required:
   extends: .fan_in
   needs:
-    - spotless
-    - muzzle
-    - test_published_artifacts
-    - agent_integration_tests
+    - job: spotless
+      optional: true
+    - job: muzzle
+      optional: true
+    - job: test_published_artifacts
+      optional: true
+    - job: agent_integration_tests
+      optional: true
 
 deploy_to_profiling_backend:
   stage: publish