feat: init-templates enable test cleanup by default (#986)

Since `aws-cdk-lib` 2.232.0, it has support for enabling automatic
temporary test directory cleanup in jest:
aws/aws-cdk#36226 This needs to be explicitly
enabled via jest config though.

Upgrade to the latest `aws-cdk-lib` version and turn on that setting in
the init templates.


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Author: rix0rrr