feat(pipelines): Add feature to display all changesets for stage before manual approval step + added postPrepare Step #25413

[Nico-DB]

Describe the feature

I would like to "run" all changesets of a stage at first, then have a manual approval step and then perform the execute change set in the original run-order.

Use Case

The use case is, that we would like to check the changesets for all stacks of an environment, to be able to perform a qualified manual approval.

Closes #24072.

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

[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.

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[aws-cdk-automation]

Your pull request must be based off of a branch in a personal account (not an organization owned account, and not the main branch). You must also have the setting enabled that allows the CDK team to push changes to your branch (this setting is enabled by default for personal accounts, and cannot be enabled for organization owned accounts). The reason for this is that our automation needs to synchronize your branch with our main after it has been approved, and we cannot do that if we cannot push to your branch.

[aws-cdk-automation]

The pull request linter fails with the following errors:

❌ Features must contain a change to an integration test file and the resulting snapshot.
❌ Pull requests from `main` branch of a fork cannot be accepted. Please reopen this contribution from another branch on your fork. For more information, see https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md#step-4-pull-request.

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[aws-cdk-automation]

Your pull request must be based off of a branch in a personal account (not an organization owned account, and not the main branch). You must also have the setting enabled that allows the CDK team to push changes to your branch (this setting is enabled by default for personal accounts, and cannot be enabled for organization owned accounts). The reason for this is that our automation needs to synchronize your branch with our main after it has been approved, and we cannot do that if we cannot push to your branch.

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 7434934
• Result: FAILED
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