simplify on_crash hook example (#15079)

docs/3.0rc/develop/state-hooks.mdx

@@ -165,36 +165,24 @@ Here's how to create a hook that deletes a Cloud Run job if the flow run crashes
 ```python
 import os
 from prefect import flow, task
-from prefect.variables import Variable
-from prefect.client.orchestration import get_client
-import prefect.runtime
 
-async def delete_cloud_run_job(flow, flow_run, state):
-    """Flow run state change hook that deletes a Cloud Run Job if
-    the flow run crashes."""
+def delete_cloud_run_job(flow, flow_run, state):
+    """hook that deletes the Cloud Run Job associated with the flow run."""
 
-    # retrieve Cloud Run job name
-    cloud_run_job_name = await Variable.get(
-        name="crashing-flow_cloud_run_job"
-    )
-
-    # delete Cloud Run job
-    delete_job_command = f"yes | gcloud beta run jobs delete 
-    {cloud_run_job_name.value} --region us-central1"
-    os.system(delete_job_command)
+    cloud_run_job_name = flow_run.name
 
+    delete_cloud_run_job_command = (
+        "yes | gcloud beta run jobs delete"
+        f"{cloud_run_job_name} --region us-central1"
+    )
+    os.system(delete_cloud_run_job_command)
 
 @task
 def my_task_that_crashes():
-    raise SystemExit("Crashing on purpose!")
+    raise SystemExit("Crashing out! 💥")
 
 @flow(on_crashed=[delete_cloud_run_job])
 def crashing_flow():
-    """Save the flow run name (i.e. Cloud Run job name) as a 
-    Variable. It then executes a task that ends up crashing."""
-    flow_run_name = prefect.runtime.flow_run.name
-    cloud_run_job_name = Variable.set(name="crashing_flow_cloud_run_job", value=flow_run_name, overwrite=True)
-
     my_task_that_crashes()
 
 if __name__ == "__main__":