code: def fetch_pr_labels():
      """
      Returns the labels associated with the current pull request.
      """
      if "GITHUB_ACTIONS" not in os.environ:
          return None
  
      if os.environ.get("GITHUB_EVENT_NAME") != "pull_request":
          return None
  
      with open(os.environ["GITHUB_EVENT_PATH"]) as f:
          pr_data = json.load(f)
          return [
              label["name"]
              for label in pr_data["pull_request"]["labels"]
          ]
  
imports: import json
  import os
  import posixpath
  import shutil
  import subprocess
  import sys
  import click
  import pytest
  from mlflow.environment_variables import _MLFLOW_TESTING, MLFLOW_TRACKING_URI
  from mlflow.version import VERSION
  from tests.helper_functions import get_safe_port
label_desc: Use image node_id 6 for calling a global function with example usage: fetch_pr_labels() and returns: None, None, unknown