chore(cli): update Command enum (#32688)

This is a stopgap -- `Command` should eventually be generated but I do not have capability to generate enums or an equivalent type to replace this yet. 

I am using `Command` as an exhaustive list to generate other code blocks; it was not used that way in the past so it hasn't needed to be updated with new commands as they've been added.

### Checklist
- [x] My code adheres to the [CONTRIBUTING GUIDE](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md) and [DESIGN GUIDELINES](https://github.com/aws/aws-cdk/blob/main/docs/DESIGN_GUIDELINES.md)

----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: kaizencc

packages/aws-cdk/lib/settings.ts

@@ -32,6 +32,15 @@ export enum Command {
   INIT = 'init',
   VERSION = 'version',
   WATCH = 'watch',
+  GC = 'gc',
+  ROLLBACK = 'rollback',
+  IMPORT = 'import',
+  ACKNOWLEDGE = 'acknowledge',
+  NOTICES = 'notices',
+  MIGRATE = 'migrate',
+  CONTEXT = 'context',
+  DOCS = 'docs',
+  DOCTOR = 'doctor',
 }
 
 const BUNDLING_COMMANDS = [