Allow hassfest to validate specific integrations (#34277)

script/hassfest/config_flow.py

@@ -68,6 +68,9 @@ def validate(integrations: Dict[str, Integration], config: Config):
     config_flow_path = config.root / "homeassistant/generated/config_flows.py"
     config.cache["config_flow"] = content = generate_and_validate(integrations)
 
+    if config.specific_integrations:
+        return
+
     with open(str(config_flow_path)) as fp:
         if fp.read().strip() != content:
             config.add_error(