Fix use of CI_PROJECT_NAME for syncing branches

The variable CI_PROJECT_NAME only includes the project name, not the
entire namespace; for that you need to use CI_PROJECT_PATH.

The incorrect use of this variable meant that stable and security
branches would not be synced to the appropriate target repositories.

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

@@ -371,11 +371,11 @@
 ##################
 .releases:rules:canonical-dot-com-gitlab-stable-branch-only:
   rules:
-    - if: '$CI_SERVER_HOST == "gitlab.com" && $CI_PROJECT_NAME == "gitlab-org/gitlab" && $CI_COMMIT_REF_NAME =~ /^[\d-]+-stable-ee$/'
+    - if: '$CI_SERVER_HOST == "gitlab.com" && $CI_PROJECT_PATH == "gitlab-org/gitlab" && $CI_COMMIT_REF_NAME =~ /^[\d-]+-stable-ee$/'
 
 .releases:rules:canonical-dot-com-security-gitlab-stable-branch-only:
   rules:
-    - if: '$CI_SERVER_HOST == "gitlab.com" && $CI_PROJECT_NAME == "gitlab-org/security/gitlab" && $CI_COMMIT_REF_NAME =~ /^[\d-]+-stable-ee$/'
+    - if: '$CI_SERVER_HOST == "gitlab.com" && $CI_PROJECT_PATH == "gitlab-org/security/gitlab" && $CI_COMMIT_REF_NAME =~ /^[\d-]+-stable-ee$/'
 
 #################
 # Reports rules #