feat(cli): add coder users delete command (#10115)

cli/testdata/coder_users_--help.golden

@@ -11,6 +11,7 @@ SUBCOMMANDS:
     activate    Update a user's status to 'active'. Active users can fully
                 interact with the platform
     create      
+    delete      Delete a user by username or user_id.
     list        
     show        Show a single user. Use 'me' to indicate the currently
                 authenticated user.

cli/testdata/coder_users_delete_--help.golden

@@ -0,0 +1,11 @@
+coder v0.0.0-devel
+
+USAGE:
+  coder users delete <username|user_id>
+
+  Delete a user by username or user_id.
+
+  Aliases: rm
+
+———
+Run `coder --help` for a list of global options.

cli/testdata/coder_users_suspend_--help.golden

@@ -6,8 +6,6 @@ USAGE:
   Update a user's status to 'suspended'. A suspended user cannot log into the
   platform
 
-  Aliases: rm, delete
-
    $ coder users suspend example_user
 
 OPTIONS: