fix(ecs): unclear docs on valid ec2 task definition placement constraints and no validation of input #25933

[Adibuer-lab]

Docs were unclear on valid placement constraints. You can specify distinctInstances when creating a Service, or running a task. You can specify memberOf when doing the previous two actions, or when creating a task or new revision. So far only memberOf is valid for ec2 task definitions.

This pull request enhances the documentation and validation for task definition placement constraints in the aws-cdk-lib/aws-ecs package. The documentation now includes a note clarifying the valid placement constraints and a new validatePlacementConstraints method has been added to the Ec2TaskDefinition class to validate the constraints at synth time.

The changes include:

Enhancement of documentation in ec2-task-definition.ts to include a note about valid placement constraints.
Addition of the validatePlacementConstraints method in ec2-task-definition.ts to validate placement constraints at synth time.
Addition of unit tests in ec2-task-definition.test.ts to verify the correct behavior of the new validatePlacementConstraints method.
Addition of integration tests to ensure overall functionality.
Closes #25905.

Revival of #25933

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[Adibuer-lab]

@kaizencc made requested changes

[mrgrain]

Hi and thanks for your contribution! We can only accept contributions that comply with our license requirements.
Please include the following statement in you PR description.

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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*

[Adibuer-lab]

Hi and thanks for your contribution! We can only accept contributions that comply with our license requirements. Please include the following statement in you PR description.

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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*

Done :)

[kaizencc]

Hi @Adibuer-lab! Thanks for reviving this PR! Just one comment about the valid constraints, did one just get added?

Pull request has been modified.

[kaizencc]

Thanks @Adibuer-lab

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[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).