Do not run e2e pipeline on schedules (#7281)

Author: nccatoni

.gitlab-ci.yml

@@ -353,7 +353,7 @@ system_tests_param:
       " > set_vars.sh
       source set_vars.sh
     - |
-      if [ "$CI_COMMIT_BRANCH" != "main" ]; then
+      if [ "$CI_COMMIT_BRANCH" != "main" ] && [ "$CI_PIPELINE_SOURCE" != "schedule" ]; then
         export LIBRARIES=""
       fi
     # TEMPORARY: filter LIBRARIES via E2E_SUPPORTED_LANGUAGES (space-separated allowlist)