Update dump_devinfo for raw discovery json and common redactors (#1358)

This PR does a few related things to dump_devinfo:

- Store the raw discovery result in the fixture.
- Consolidate redaction logic so it's not duplicated in dump_devinfo.
- Update existing fixtures to:
  - Store raw discovery result under `result`
  - Use `SCRUBBED_CHILD_DEVICE_ID` everywhere
  - Have correct values as per the consolidated redactors.

tests/device_fixtures.py

@@ -435,7 +435,7 @@ async def get_device_for_fixture(
 
     discovery_data = None
     if "discovery_result" in fixture_data.data:
-        discovery_data = fixture_data.data["discovery_result"]
+        discovery_data = fixture_data.data["discovery_result"]["result"]
     elif "system" in fixture_data.data:
         discovery_data = {
             "system": {"get_sysinfo": fixture_data.data["system"]["get_sysinfo"]}