fix(pipelines): using the same repo more than once as a connection in a pipeline causes duplicate id error

[scanlonp]

Differentiates between sources of the same repository by appending the branch name onto the node id and input/output artifacts. This avoids the duplicate id errors for different branches of the same repository, as well as validating that each source is a unique repository & branch combination.

The only change to the CFN template is the input & output artifacts, but since these are not stateful resources, they can be modified without breaking changes. The artifacts are also updates in tandem, so the pipeline source behavior will stay the same.

This change impacts these CodePipelineSources:

• s3() - objectKey appended
• connection()
• codeCommit()

Does not change ecr() behavior as there is no notion of folders or branches.
Does not change github() behavior as doing so would cause destructive changes of webhooks.

Closes #23916 and #19875.

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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

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[scanlonp]

I have tested this locally, but I am still working on tests - both unit and integ. Wanted to first get confirmation that this will not be a breaking change.

✅ Updated pull request passes all PRLinter validations. Dismissing previous PRLinter review.

[scanlonp]

@Mergifyio update

[mergify]

update

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AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: a30cabe
• Result: FAILED
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[scanlonp]

Reopened in #27602.