chore(python): add nox session to sort python imports (#254)

Source-Link: googleapis/synthtool@1b71c10
Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-python:latest@sha256:00c9d764fd1cd56265f12a5ef4b99a0c9e87cf261018099141e2ca5158890416

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

cloud_tasks/snippets/delete_queue_test.py

@@ -21,7 +21,6 @@
 
 import delete_queue
 
-
 TEST_PROJECT_ID = os.environ["GOOGLE_CLOUD_PROJECT"]
 TEST_LOCATION = os.getenv("TEST_QUEUE_LOCATION", "us-central1")
 TEST_QUEUE_NAME = f"my-queue-{uuid.uuid4().hex}"