Core: Services: Kraken: Allow fetching availbale versions of a given Extension #5637

Job	Run time
frontend-tests	1m 18s
python-tests	3m 43s
deploy-docker-images (bootstrap, blueos, linux/arm/v7,linux/arm64/v8,linux/amd64)	56s
deploy-docker-images (core, blueos, linux/arm/v7,linux/arm64/v8,linux/amd64)	16m 7s
deploy-raspberry-image	0s
	22m 4s

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