fix(scheduler-targets-alpha): imported Schedule targets cause synth-time error

[samson-keung]

Issue # (if applicable)

Closes #29615.

Reason for this change

The target classes in the aws-scheduler-targets-alpha module has a check to ensure the target itself and the Schedule invoking the target are in the same environment (i.e. in the same account and same region). Such check prevents users from using imported targets with the Schedule construct.

Description of changes

Removed the check in all target classes.

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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• Commit ID: beca3d7
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