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We're running an orion instance.
Since orion is not using an externally hosted API, `PREFECT_API_URL` is not set (`PREFECT_ORION_UI_API_URL` is).
```printenv | grep -E "PREFECT.*API"
# PREFECT_ORION_UI_API_URL=<https://domain.tld/api>```
FlowRunNotifications <https://github.com/PrefectHQ/prefect/blob/a2134b281d5b1c7cdc54c364bc3d84de9be8c4b1/src/prefect/orion/services/flow_run_notifications.py#L144|use> `PREFECT_API_URL` as base api url and since `PREFECT_API_URL` is not set `api_url` defaults to a rather useless `<http://ephemeral-orion/api>`.
I'm wondering if it would make sense to change this line to use `PREFECT_ORION_UI_API_URL` if `PREFECT_API_URL` is not set.
I see that `PREFECT_ORION_UI_API_URL` defaults to `PREFECT_API_URL`, but I think if I set `PREFECT_API_URL` to a seemingly external url api calls from ui will stop being routed through loopback and that would be a whole thing.