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

[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]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 00f9849
• Result: FAILED
• Build Logs (available for 30 days)

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[scanlonp]

Hey @Nico-DB, it looks like the build is failing with some more serious errors. It appears that some tests are failing with destructive changes. We generally cannot give a review until the build is passing. Also if these destructive changes are necessary or intended, we will need a strong justification.

[Nico-DB]

Hey @scanlonp,
thanks for checking the errors. Could you explain what destructive changes means here? Since i am trying to add this feature for more then a year now, it could be that things changed in the meantime. When i created this feature and testet, i could not see destructive changes

[aws-cdk-automation]

This PR has been in the BUILD FAILING state for 3 weeks, and looks abandoned. To keep this PR from being closed, please continue work on it. If not, it will automatically be closed in a week.

[aws-cdk-automation]

This PR has been deemed to be abandoned, and will be automatically closed. Please create a new PR for these changes if you think this decision has been made in error.

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