Don't use ee/.gitlab/ for CI config files

These files are not available in CE, resulting in CI pipeline failures
when trying to include these files. Since the job is already configured
to only run on EE, we can just include it in both CE and EE.

.gitlab-ci.yml

@@ -41,3 +41,4 @@ include:
   - local: .gitlab/ci/setup.gitlab-ci.yml
   - local: .gitlab/ci/test-metadata.gitlab-ci.yml
   - local: .gitlab/ci/yaml.gitlab-ci.yml
+  - local: .gitlab/ci/ee-specific-checks.gitlab-ci.yml

.gitlab/ci/ee-specific-checks.gitlab-ci.yml

+.ee-specific-check:
+  extends: .default-tags
+  dependencies: []
+  only:
+    - branches@gitlab-org/gitlab-ee
+  except:
+    - master
+    - tags
+    - /[\d-]+-stable(-ee)?/
+    - /[\d-]+-auto-deploy-\d{7}/
+    - /^security-/
+    - /\bce\-to\-ee\b/
+
+ee-files-location-check:
+  extends: .ee-specific-check
+  script:
+    - scripts/ee-files-location-check
+
+ee-specific-lines-check:
+  extends: .ee-specific-check
+  script:
+    - scripts/ee-specific-lines-check