Remove unused branch sha check.

Author: jonsimantov

scripts/gha/trigger_workflow.py

@@ -68,16 +68,10 @@ def main():
   workflows = firebase_github.list_workflows(args.token, args.workflow, args.branch)
   run_id = 0
   if "workflow_runs" in workflows:
-    try:
-      branch_sha = subprocess.check_output(['git', 'rev-parse', args.branch]).decode('utf-8').rstrip('\n')
-    except subprocess.CalledProcessError as e:
-      # Failed to get branch SHA, ignore.
-      branch_sha = None
     for workflow in workflows['workflow_runs']:
       # Use a heuristic to get the new workflow's run ID.
       # Must match the branch name and commit sha, and be queued/in progress.
       if (workflow['status'] in ('queued', 'in_progress') and
-          (workflow['head_sha'] == branch_sha or not branch_sha) and
           workflow['head_branch'] == args.branch):
         run_id = workflow['id']
         break