fix(core): Custom Resource type length validation

[dontirun]

The resource type length validation did not include the Custom:: prefix which CloudFormation counts towards the total character count

Related to #22055

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[gitpod-io]

[dontirun]

This is related to #22119 @corymhall

[Naumel]

Hello, thank you for taking the time and submitting a review -- have you noticed the PR linter failing on a lack of testing?

[aws-cdk-automation]

The pull request linter has failed. See the aws-cdk-automation comment below for failure reasons. If you believe this pull request should receive an exemption, please comment and provide a justification.

[dontirun]

@Naumel I missed that, I thought I had added one in 🤦🏾‍♂️. Added one!

✅ Updated pull request passes all PRLinter validations. Dissmissing previous PRLinter review.

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[aws-cdk-automation]

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• Commit ID: a15f22a
• Result: SUCCEEDED
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[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).