Add default headers to webserver responses (#97784)

* Add default headers to webserver responses

* Set default server header

* Fix other tests

tests/scripts/test_check_config.py

@@ -117,6 +117,7 @@ def test_secrets(mock_is_file, event_loop, mock_hass_config_yaml: None) -> None:
         "login_attempts_threshold": -1,
         "server_port": 8123,
         "ssl_profile": "modern",
+        "use_x_frame_options": True,
     }
     assert res["secret_cache"] == {
         get_test_config_dir("secrets.yaml"): {"http_pw": "http://google.com"}