add flow run to task run logging

[jakekaplan]

closes: #8611

Changing the logging formatter for task runs in https://github.com/PrefectHQ/prefect/blob/2.8.2/src/prefect/logging/logging.yml#L20 to:

task_run_fmt: "%(asctime)s.%(msecs)03d | %(levelname)-7s | Flow run %(flow_run_name)r - Task run %(task_run_name)r - %(message)s"

from prefect import flow, get_run_logger, task
from prefect.context import get_run_context


@task
def say_hello_world() -> None:
    logger = get_run_logger()
    logger.info("Hello World")


@flow(name="hello-world")
def main_flow() -> None:
    logger = get_run_logger()

    flow_context = get_run_context()

    logger.info(f"Running flow at {flow_context.start_time}")

    say_hello_world()


if __name__ == "__main__":
    main_flow()

Logs Before:

13:36:41.000 | INFO    | prefect.engine - Created flow run 'arcane-oyster' for flow 'hello-world'
13:36:41.553 | INFO    | Flow run 'arcane-oyster' - Running flow at 2023-04-10T17:36:41.552682+00:00
13:36:41.903 | INFO    | Flow run 'arcane-oyster' - Created task run 'say_hello_world-0' for task 'say_hello_world'
13:36:41.905 | INFO    | Flow run 'arcane-oyster' - Executing 'say_hello_world-0' immediately...
13:36:42.249 | INFO    | Flow run 'arcane-oyster' - Task run 'say_hello_world-0' - Hello World
13:36:42.497 | INFO    | Flow run '<unknown>' - Task run 'say_hello_world-0' - Finished in state Completed()
13:36:42.760 | INFO    | Flow run 'arcane-oyster' - Finished in state Completed('All states completed.')

Logs After:

13:36:09.041 | INFO    | prefect.engine - Created flow run 'eminent-dragonfly' for flow 'hello-world'
13:36:10.053 | INFO    | Flow run 'eminent-dragonfly' - Running flow at 2023-04-10T17:36:10.052348+00:00
13:36:10.196 | INFO    | Flow run 'eminent-dragonfly' - Created task run 'say_hello_world-0' for task 'say_hello_world'
13:36:10.197 | INFO    | Flow run 'eminent-dragonfly' - Executing 'say_hello_world-0' immediately...
13:36:10.975 | INFO    | Flow run 'eminent-dragonfly' - Task run 'say_hello_world-0' - Hello World
13:36:11.119 | INFO    | Flow run 'eminent-dragonfly' - Task run 'say_hello_world-0' - Finished in state Completed()
13:36:11.358 | INFO    | Flow run 'eminent-dragonfly' - Finished in state Completed('All states completed.')

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[jakekaplan]

Not really sure if this is how we want to solve this or if there is a downside to making this api call here, happy to just close this and go another direction 😄