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

[gracelu0]

Issue # (if applicable)

Tracking #31785

Reason for this change

Similar to what was done in this PR for the Lambda Invoke target: #31837.
Reasoning is explained in this comment:

At synth time, there are cases where CDK does not know about the actual environment (e.g. when the environment is using Tokens). In other words, the environment check works in some scenarios and not others. This creates more confusion than benefit.
IF cross env target support is added in the future, this check will become a blocker for CDK customers to set up cross env target.

Description of changes

Remove synth-time error that checks for same account and region for all targets to allow use of imported resources as target.

Description of how you validated changes

All tests are passing.

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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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.19%. Comparing base (dcb5cf1) to head (eab1676).
Report is 1 commits behind head on main.

Additional details and impacted files

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##             main   #32105   +/-   ##
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  Coverage   77.19%   77.19%           
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  Files         105      105           
  Lines        7164     7164           
  Branches     1311     1311           
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  Hits         5530     5530           
  Misses       1454     1454           
  Partials      180      180           

Flag	Coverage Δ
suite.unit	77.19% <ø> (ø)

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Components	Coverage Δ
packages/aws-cdk	77.19% <ø> (ø)

✅ Updated pull request passes all PRLinter validations. Dismissing previous PRLinter review.

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AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: eab1676
• Result: SUCCEEDED
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