refactor AWS "region" used in test framework

[nithyatsu]

Currently, we set region in our actions and use it for deploying AWS resources. We have hardcoded the region in validation code and use to verify the deployment worked correctly. Both regions should match for tests to work correctly. Further, long running tests set region in in actions too.
We should revisit the code, and if it makes sense, set region in a single location and remove hard-coding.

AB#13802

[brooke-hamilton]

@nithyatsu is this causing test failures? If so we should prioritize this. Otherwise we can prioritize this as an optimization.

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