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: https://github.com/aws/aws-cdk/pull/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

• [x] My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

---

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #32105 +/- ## ======================================= Coverage 77.19% 77.19% ======================================= Files 105 105 Lines 7164 7164 Branches 1311 1311 ======================================= Hits 5530 5530 Misses 1454 1454 Partials 180 180 ``` | [Flag](https://app.codecov.io/gh/aws/aws-cdk/pull/32105/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aws) | Coverage Δ | | |---|---|---| | [suite.unit](https://app.codecov.io/gh/aws/aws-cdk/pull/32105/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aws) | `77.19% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aws#carryforward-flags-in-the-pull-request-comment) to find out more. | [Components](https://app.codecov.io/gh/aws/aws-cdk/pull/32105/components?src=pr&el=components&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aws) | Coverage Δ | | |---|---|---| | [packages/aws-cdk](https://app.codecov.io/gh/aws/aws-cdk/pull/32105/components?src=pr&el=component&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aws) | `77.19% <ø> (ø)` | |

[mergify[bot]]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: eab16769c058c7331b827edb66a4417a3e0418f4
• Result: SUCCEEDED
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[mergify[bot]]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

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