CEXT-5293: Env-specifig region options for db

[pdohogne-magento]

Description

Validate input for the region flag/config option against the current cli environment.

See also:

• https://git.corp.adobe.com/CNA/adp-storage-database-deploy/pull/45
• CEXT-5293: Separating region options by environment aio-lib-db#35

Related Issue

CEXT-5293: Normalize ABDB service urls in Stage

Motivation and Context

Available regions for aio-lib-db are different in stage than prod, so the input needs to be validated against the current CLI environment.

How Has This Been Tested?

Unit and manual tests

Screenshots (if appropriate):

• Proof of functionality:

• Proof of passing tests:

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[nofuss]

no complaints from me