Add GitLab Markdown AR extension to db rules

.gitlab/ci/rules.gitlab-ci.yml

@@ -209,6 +209,7 @@
   - "{,ee/,jh/}{,spec/}lib/{,ee/,jh/}gitlab/background_migration/**/*"
   - "{,ee/,jh/}{,spec/}lib/{,ee/,jh/}gitlab/background_migration{,_spec}.rb"
   - "{,ee/,jh/}spec/support/helpers/database/**/*"
+  - "lib/gitlab/markdown_cache/active_record/**/*"
   - "config/prometheus/common_metrics.yml"  # Used by Gitlab::DatabaseImporters::CommonMetrics::Importer
   - "{,ee/,jh/}app/models/project_statistics.rb"  # Used to calculate sizes in migration specs
   - "GITALY_SERVER_VERSION" # Has interactions with background migrations:https://gitlab.com/gitlab-org/gitlab/-/issues/336538