fix(redshift-alpha): replace deprecated Provider role with frameworkOnEventRole

[syukawa-gh]

Issue

Closes #37006

Reason for this change

The DatabaseQuery construct in aws-redshift-alpha was using the deprecated role property on custom_resources.Provider, which triggers deprecation warnings during synthesis:

[WARNING] aws-cdk-lib.custom_resources.ProviderProps#role is deprecated

Description of changes

Replaced role with frameworkOnEventRole in the Provider constructor call in database-query.ts. Since the Redshift DatabaseQuery construct does not use isCompleteHandler, only the frameworkOnEventRole is needed (no frameworkCompleteAndTimeoutRole required).

The behavior is functionally equivalent — the same IAM role is assigned to the framework's onEvent Lambda function.

Description of how you validated changes

• frameworkOnEventRole is the documented replacement for the deprecated role property
• The Provider implementation shows that role and frameworkOnEventRole are applied to the same Lambda function via this.role ?? role in createFunction()
• No isCompleteHandler is used, so only the onEvent role is relevant

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

[aws-cdk-automation]

The pull request linter fails with the following errors:

❌ Fixes must contain a change to an integration test file and the resulting snapshot.

If you believe this pull request should receive an exemption, please comment and provide a justification. A comment requesting an exemption should contain the text Exemption Request. Additionally, if clarification is needed, add Clarification Request to a comment.

✅ A exemption request has been requested. Please wait for a maintainer's review.

[syukawa-gh]

Exemption Request: This change is a minimal fix that does not alter CloudFormation resource behavior in a way that requires a new integration test. The fix is covered by unit tests.

[syukawa-gh]

Exemption Request: This fix replaces the deprecated Provider role with frameworkOnEventRole in redshift-alpha. Integration test snapshot is unchanged as the synthesized CloudFormation output is identical.