feat: support ap-southeast-5 region

[duncanista]

What does this PR do?

• Updates our pipeline
• Adds ap-southeast-5 to regions to deploy

Motivation

DataDog/datadog-lambda-js#576

Testing Guidelines

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)

[apiarian-datadog]

is this all of the regions that exist? or all minus some set of explicitly unsupported ones? should we query them instead of listing them manually?

[duncanista]

is this all of the regions that exist? or all minus some set of explicitly unsupported ones? should we query them instead of listing them manually?

Yes,
No,
The query only returns the ones available in your region, therefore, this would require us to have multiple steps to verify them. This is OK, as is our best current solution.

[duncanista]

Tested manually in GitLab, this works.