Add note about update coordinator in test-before-setup IQS rule (#2486)

Co-authored-by: Franck Nijhof <[email protected]>

Author: epenet

docs/core/integration-quality-scale/rules/test-before-setup.md

@@ -42,6 +42,10 @@ async def async_setup_entry(hass: HomeAssistant, entry: MyIntegrationConfigEntry
     return True
 ```
 
+:::info
+Please note that this may also be implemented implicitly when using a data update coordinator via `await coordinator.async_config_entry_first_refresh()`.
+:::
+
 ## Additional resources
 
 More information about config entries and their lifecycle can be found in the [config entry documentation](../../../config_entries_index).