Core: Services: Kraken: Allow fetching availbale versions of a given Extension #5636

Job	Run time
frontend-tests	1m 9s
python-tests	3m 44s
deploy-docker-images (bootstrap, blueos, linux/arm/v7,linux/arm64/v8,linux/amd64)	1m 11s
deploy-docker-images (core, blueos, linux/arm/v7,linux/arm64/v8,linux/amd64)	14m 48s
deploy-raspberry-image	0s
	20m 52s

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