feat(chatbot): throw ValidationError instead of untyped Error (aws#33439)

### Issue 

Relates to aws#32569 

### Description of changes

`ValidationError` in one location

### Describe any new or updated permissions being added

n/a

### Description of how you validated changes

Existing tests. Exemptions granted as this is a refactor of existing code.

### 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/.eslintrc.js

@@ -32,6 +32,7 @@ const enableNoThrowDefaultErrorIn = [
   'aws-autoscaling-common',  
   'aws-backup',
   'aws-batch',
+  'aws-chatbot',
   'aws-cognito',
   'aws-cloudfront',
   'aws-cloudfront-origins',

packages/aws-cdk-lib/aws-chatbot/lib/slack-channel-configuration.ts

@@ -219,7 +219,7 @@ export class SlackChannelConfiguration extends SlackChannelConfigurationBase {
     const resourceName = cdk.Arn.extractResourceName(slackChannelConfigurationArn, 'chat-configuration');
 
     if (!cdk.Token.isUnresolved(slackChannelConfigurationArn) && !re.test(resourceName)) {
-      throw new Error('The ARN of a Slack integration must be in the form: arn:<partition>:chatbot:<region>:<account>:chat-configuration/slack-channel/<slackChannelName>');
+      throw new cdk.ValidationError('The ARN of a Slack integration must be in the form: arn:<partition>:chatbot:<region>:<account>:chat-configuration/slack-channel/<slackChannelName>', scope);
     }
 
     class Import extends SlackChannelConfigurationBase {