fix(stepfunction-tasks): eventbridge aws. event source prefix check is more strict than it should be

[pahud]

1. fix the event source validation
2. move the validation from renderEntries() to validateEntries()
3. add unit tests

Issue # (if applicable)

Closes #30191

Reason for this change

Description of changes

Description of how you validated changes

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: a5c0240
• Result: SUCCEEDED
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[pahud]

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