feat(stepfunctions): Supporting all regions in Execution ARNs

[l0minous]

Problem

Currently Execution Details only supports us-east-1 executions

Solution

Passing region parsed from execution ARN as a meta tag
Separating apiCallMessageHandler to Execution Details and Workflow Studio message handlers accordingly

---

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[github-actions]

• This pull request modifies code in src/* but no tests were added/updated.
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[zelzhou]

Is there plan to add the region tag to WFS handler as well?

[l0minous]

State machines have separate ARNs / ARN handling on the console side that needs to be adjusted first

[yueny2020]

/retryBuilds