Fix race in gardena_bluetooth config flow tests (#111042)

tests/components/gardena_bluetooth/snapshots/test_config_flow.ambr

@@ -1,17 +1,17 @@
 # serializer version: 1
 # name: test_bluetooth
   FlowResultSnapshot({
-    'data_schema': None,
-    'description_placeholders': dict({
-      'name': 'Gardena Water Computer',
+    'context': dict({
+      'confirm_only': True,
+      'source': 'bluetooth',
+      'title_placeholders': dict({
+        'name': 'Gardena Water Computer',
+      }),
+      'unique_id': '00000000-0000-0000-0000-000000000001',
     }),
-    'errors': None,
     'flow_id': <ANY>,
     'handler': 'gardena_bluetooth',
-    'last_step': None,
-    'preview': None,
     'step_id': 'confirm',
-    'type': <FlowResultType.FORM: 'form'>,
   })
 # ---
 # name: test_bluetooth.1

tests/components/gardena_bluetooth/test_config_flow.py

@@ -100,13 +100,12 @@ async def test_bluetooth(
 ) -> None:
     """Test bluetooth device discovery."""
 
+    # Inject the service info will trigger the flow to start
     inject_bluetooth_service_info(hass, WATER_TIMER_SERVICE_INFO)
+    await hass.async_block_till_done()
+
+    result = next(iter(hass.config_entries.flow.async_progress_by_handler(DOMAIN)))
 
-    result = await hass.config_entries.flow.async_init(
-        DOMAIN,
-        context={"source": config_entries.SOURCE_BLUETOOTH},
-        data=WATER_TIMER_SERVICE_INFO,
-    )
     assert result == snapshot
 
     result = await hass.config_entries.flow.async_configure(