[Serve] Fix serve run help message (#37859)

Re: #35754 We previously added `-h` help command to the serve cli's click group. This caused the autogenerated help message to take `-h` as the default help command. For `serve run` we have a collusion on `-h` as it's used for host option as well. This PR changed the order of the click help option so the `--help` will be used in autogenerated help messages.

python/ray/serve/scripts.py

@@ -124,7 +124,7 @@ def convert_args_to_dict(args: Tuple[str]) -> Dict[str, str]:
 
 @click.group(
     help="CLI for managing Serve applications on a Ray cluster.",
-    context_settings=dict(help_option_names=["-h", "--help"]),
+    context_settings=dict(help_option_names=["--help", "-h"]),
 )
 def cli():
     pass