[serve] Add validation for 'proxy_location' and 'http_options' config parameters for the 'serve deploy' command

Signed-off-by: axreldable <aleksei.starikov.ax@gmail.com>

Author: axreldable

python/ray/serve/scripts.py

@@ -300,11 +300,7 @@ def _validate_deployment_config(
     ), f"new_config must be ServeDeploySchema, got {type(new_config)!r}"
 
     curr_proxy_location = curr_serve_details.proxy_location
-    new_proxy_location = (
-        new_config.proxy_location
-        if "proxy_location" in new_config.__fields_set__
-        else None
-    )
+    new_proxy_location = new_config.dict(exclude_unset=True).get("proxy_location")
     if (
         new_proxy_location is not None
         and curr_proxy_location is not None