ci(service-project): Drop AI Gateway specific trigger.

AI Gateway's CI setup has been standardized in
gitlab-org/modelops/applied-ml/code-suggestions/ai-assist!675

ci-tasks/service-project/impl.yml

@@ -41,8 +41,6 @@ stages:
       changes: &validate_changes
         - .runway/runway*.yml
         - $CI_CONFIG_PATH
-        # Specific to AI Gateway
-        - ci/gitlab-com.yml
     - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH
   artifacts:
     reports: