Enable precommit yaml xlang test on code push. (#39071)

Author: shunping

.github/workflows/beam_PreCommit_Yaml_Xlang_Direct.yml

@@ -65,6 +65,7 @@ env:
 jobs:
   beam_PreCommit_Yaml_Xlang_Direct:
     if: |
+      github.event_name == 'push' ||
       github.event_name == 'workflow_dispatch' ||
       github.event_name == 'pull_request_target' ||
       (github.event_name == 'schedule' && github.repository == 'apache/beam') ||