ci: Run 'jest:minimal' upon backend changes in MRs

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

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

@@ -650,8 +650,6 @@
       changes: *code-backstage-patterns
     - <<: *if-security-merge-request
       changes: *code-backstage-patterns
-    - <<: *if-default-refs
-      changes: *backend-patterns
     - <<: *if-merge-request-not-approved
       when: never
     - <<: *if-default-refs
@@ -670,9 +668,6 @@
     - <<: *if-default-refs
       changes: *core-frontend-patterns
       when: never
-    - <<: *if-default-refs
-      changes: *backend-patterns
-      when: never
     - <<: *if-merge-request
       changes: *ci-patterns
       when: never