feat(construct.awscdk.github-pipeline): S3BucketStep, CheckoutStep, GithubCodePipeline workflow builder

[BradenM]

• feat(construct.awscdk.github-pipeline): make cdk-pipelines-github a peer dependency
• feat(construct.awscdk.github-pipeline): S3BucketStep for performing s3 actions
• feat(construct.awscdk.github-pipeline): CheckoutStep for checkout action
• fix(construct.awscdk.github-pipeline): only patch checkout steps without explicit parameters
• fix(construct.awscdk.github-pipeline): do not require inputs for workflow call/dispatch
• feat(construct.awscdk.github-pipeline): ensure both stage/waves are checked for masking, do not require rootDir/assets prefix
• refactor(construct.awscdk.github-pipeline): rename github-pipeline -> workflow
• test(construct.awscdk.github-pipeline): setup vitest
• feat(construct.awscdk.github-pipeline): GithubCodePipeline builder for github workflow
• test(construct.awscdk.github-pipeline): add basic unit tests
• test(construct.awscdk.github-pipeline): update snapshots

Fixes #

[nx-cloud]

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