Remove use of AvailableServices in Amazon Q

What does this MR do and why?

Remove use of AvailableServices in Amazon Q. We are removing the latter as part of Phase 5: Remove AvailableServices interface (&15639 - closed).

We are removing this class. We can use the UP of the same name instead.

Not user-facing.

References

Related to Replace remaining AvailableServices.find_by_nam... (#564979 - closed)

Screenshots or screen recordings

n/a

How to set up and validate locally

Unsure, I would need help with this. But it should not result in any observable changes since we had already used a generated service based on the UP of the same name, so this should be safe.

MR acceptance checklist

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Related to #564979 (closed)

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