feat(stepfunctions-tasks): add cpu and memory parameters to EcsRunTask

[kackyt]

Issue # (if applicable)

Closes #30027 .

Reason for this change

As described in the issue.

Description of changes

Add cpu and memoryMiB property to EcsRunTaskProps.

Description of how you validated changes

Add unit tests.

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

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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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AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 6c74ef8
• Result: SUCCEEDED
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