fix(aws-cdk): cdk bootstrap print JSON template when using --json option

[arewa]

Fix for the issue #21456.

Added support of --json option for cdk bootstrap --show-template command.

cdk bootstrap --show-template - will print YAML template
cdk bootstrap --show-template --json - will print JSON template

How I tested it locally?

• Prepared a package with fix with yarn package and installed with npm install -g dist/js/aws-cdk-0.0.0.tgz

• Reproduced steps from the bug (aws-cdk): cdk bootstrap prints YAML template even when using --json option #21456

• Ensured that the issue is fixed

All Submissions:

• Have you followed the guidelines in our Contributing guide?

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[gitpod-io]

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 5dff792
• Result: SUCCEEDED
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[corymhall]

@arewa thanks for the contribution!

[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).