Remove AvailableServices from FetchModelDefinitionsService

Matthias Käpplerrequested to merge
564979-model-definitions into master

What does this MR do and why?

Remove AvailableServices from FetchModelDefinitionsService.

This class is being removed and replaced with unit primitives. See Phase 5: Remove AvailableServices interface (&15639 - closed).

Not user facing.

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

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Related to #564979 (closed)

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