What does this PR do?

Adds new regions from Mexico and Thailand

Motivation

https://aws.amazon.com/blogs/aws/now-open-aws-mexico-central-region/
https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-regions-availability-zones.html

Testing Guidelines

N/A

Additional Notes

Types of Changes

• Bug fix
• New feature
• Breaking change
• Misc (docs, refactoring, dependency upgrade, etc.)

Check all that apply

• This PR's description is comprehensive
• This PR contains breaking changes that are documented in the description
• This PR introduces new APIs or parameters that are documented and unlikely to change in the foreseeable future
• This PR impacts documentation, and it has been updated (or a ticket has been logged)
• This PR's changes are covered by the automated tests
• This PR collects user input/sensitive content into Datadog
• This PR passes the integration tests (ask a Datadog member to run the tests)