ci: Don't run 'as-if-jh' jobs in MRs targeting stable branches

Signed-off-by: Rémy Coutable <remy@rymai.me>

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

@@ -40,6 +40,9 @@
 .if-automated-merge-request: &if-automated-merge-request
   if: '$CI_MERGE_REQUEST_SOURCE_BRANCH_NAME == "release-tools/update-gitaly" || $CI_MERGE_REQUEST_TARGET_BRANCH_NAME =~ /stable-ee$/'
 
+.if-merge-request-targeting-stable-branch: &if-merge-request-targeting-stable-branch
+  if: '$CI_MERGE_REQUEST_IID && $CI_MERGE_REQUEST_TARGET_BRANCH_NAME =~ /^[\d-]+-stable(-ee)?$/'
+
 .if-merge-request-labels-as-if-foss: &if-merge-request-labels-as-if-foss
   if: '$CI_MERGE_REQUEST_LABELS =~ /pipeline:run-as-if-foss/'
 
@@ -576,6 +579,8 @@
       when: never
     - <<: *if-security-merge-request
       when: never
+    - <<: *if-merge-request-targeting-stable-branch
+      when: never
     - <<: *if-merge-request-labels-as-if-jh
     - <<: *if-merge-request-labels-run-all-rspec
     - changes: *code-backstage-qa-patterns
@@ -609,6 +614,8 @@
       when: never
     - <<: *if-security-merge-request
       when: never
+    - <<: *if-merge-request-targeting-stable-branch
+      when: never
     - <<: *if-merge-request-labels-as-if-jh
     - <<: *if-merge-request-labels-run-all-rspec
     - <<: *if-merge-request
@@ -1250,6 +1257,8 @@
       when: never
     - <<: *if-security-merge-request
       when: never
+    - <<: *if-merge-request-targeting-stable-branch
+      when: never
     - <<: *if-merge-request-labels-as-if-jh
       allow_failure: true
     - <<: *if-merge-request
@@ -1693,6 +1702,8 @@
       when: never
     - <<: *if-security-merge-request
       when: never
+    - <<: *if-merge-request-targeting-stable-branch
+      when: never
     - <<: *if-merge-request-labels-as-if-jh
     - <<: *if-merge-request-labels-run-all-rspec
     - changes: *code-backstage-qa-patterns