chore(cli): fix typo in ToolkitError symbol (#32882)

### Reason for this change

A typo in the symbol. We don't use this API publicly yet, so we can still fix this without impact users.

### Describe any new or updated permissions being added

n/a

### Description of how you validated changes

Existing unit tests

### 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*

packages/aws-cdk/lib/toolkit/error.ts

@@ -1,4 +1,4 @@
-const TOOLKIT_ERROR_SYMBOL = Symbol.for('@aws-cdk/core.TooklitError');
+const TOOLKIT_ERROR_SYMBOL = Symbol.for('@aws-cdk/core.ToolkitError');
 const AUTHENTICATION_ERROR_SYMBOL = Symbol.for('@aws-cdk/core.AuthenticationError');
 
 /**