fix: do not add duplicate inputs

[Nr18]

Issue #, if available: #445

Description of changes:

When using the param_overrides functionality. And you use 2 parameters from the same source. The artifact is added twice to the action. This causes the pipeline to fail.

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[sbkok]

Thanks for providing a fix for this issue.

Could you please add test cases to the following file [0] to verify that this works correctly?
That way we know it will continue to work in the future, even if this part gets refactored.

• [0] https://github.com/awslabs/aws-deployment-framework/blob/0723ddf4eaf55888ae780dc48873f0ec4766cfbd/src/lambda_codebase/initial_commit/bootstrap_repository/adf-build/shared/cdk/cdk_constructs/tests/test_adf_codepipeline_input_artifacts.py

[Nr18]

@sbkok I added 2 tests:

• 1 to make sure that inputs are not added twice (the original fix)
• 2 when using different inputs it should be added.

Also added some context on how to run the top build locally.

[sbkok]

LGTM, thanks for adding the tests too.

[javydekoning]

Manually ran our latest CI on this. All checks are passing.

PR LGTM! Thanks for contributing.