chore: remove apis and tests that were only published in v1 for pipelines

[TheRealAmazonKendra]

DELETED

All of this code and the associated tests were for CDK Pipelines V1, which was never released to cdk v2. All of the APIs are stripped from the distribution before publishing so this is just code cleanup and this will contain no breaking changes.

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

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

[TheRealAmazonKendra]

@Mergifyio update

[mergify]

update

✅ Branch has been successfully updated

[scanlonp]

legacy/ apis are all in https://github.com/aws/aws-cdk/blob/main/deprecated_apis.txt.

Test changes move the 'modern' part of the 'modern vs legacy comparison' tests to simply be the test.

Readme changes are majority formatting and no-change markdown syntax.

[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).

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 33624c6
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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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).

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