fix(scheduler-targets-alpha): imported lambda function as schedule target throws synth error

[samson-keung]

Issue # (if applicable)

Closes #29284.

Reason for this change

Removed the same env check between the Schedule and the Lambda target to allow use of imported Lambda function as target.

Description of changes

Removed the check that forces the Schedule and the Lambda function to be in the same account and region.

Description of how you validated changes

Unit test added to ensure no synth error when using imported Lambda function.

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: 8c05610
• Result: SUCCEEDED
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