Migrate AmazonQ out AvailableServices

What does this MR do and why?

Use new ::CloudConnector::Tokens.get interface/api instead of ::CloudConnector::AvailableServices (to be deprecated) in the context of AmazonQ.

How to set up and validate locally

TBD

MR acceptance checklist

Evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Related to #546587 (closed)