Create Lambda Scaler on more regions
Create Lambda Scaler on more regions

This commit will create Lambda Scaler on 4 new regions

- Africa (Cape Town)
- Asia Pacific (Hong Kong)
- Europe (Milan)
- Middle East (Bahrain)

Also reorder the region names.

holmesjr/elastic-ci-stack-for-aws,holmesjr/elastic-ci-stack-for-aws,buildkite/elastic-ci-stack-for-aws