[Compute] az sig create/update: Hide --soft-delete parameter in help messages (#29377)

Author: yanzhudd

src/azure-cli/azure/cli/command_modules/vm/_params.py

@@ -7,6 +7,7 @@
 from argcomplete.completers import FilesCompleter
 
 from knack.arguments import CLIArgumentType
+from knack.deprecation import Deprecated
 
 from azure.cli.core.profiles import ResourceType
 from azure.cli.core.commands.parameters import get_datetime_type
@@ -1322,7 +1323,8 @@ def load_arguments(self, _):
                        arg_group='Sharing Profile',
                        min_api='2020-09-30',
                        help='This property allows you to specify the permission of sharing gallery.')
-            c.argument('soft_delete', arg_type=get_three_state_flag(), min_api='2021-03-01', is_preview=True,
+            c.argument('soft_delete', arg_type=get_three_state_flag(), min_api='2021-03-01',
+                       deprecate_info=Deprecated(self.cli_ctx, hide=True, message_func=lambda x: "Argument '--soft-delete' is in preview and under development. Reference and support levels: https://aka.ms/CLI_refstatus"),
                        help='Enable soft-deletion for resources in this gallery, '
                             'allowing them to be recovered within retention time.')
             c.argument('publisher_uri', help='Community gallery publisher uri.')