Allow dryrun from cli in JSON launching case

Summary: Dryrun is a frequent flag so allow that from CLI

Differential Revision: D83681938

Author: ishachirimar

torchx/cli/cmd_run.py

@@ -413,6 +413,8 @@ def verify_no_extra_args(self, args: argparse.Namespace) -> None:
                 continue
             if action.dest == "help":  # Skip help
                 continue
+            if action.dest == "dryrun":  # Skip dryrun
+                continue
 
             current_value = getattr(args, action.dest, None)
             default_value = action.default