chore: modify keycloak healthcheck endpoint for newer keycloak #1463

Job	Run time
test-suite (active-standby-kubernetes)	12m 22s
test-suite (api)	18m 9s
test-suite (deploytarget)	11m 36s
test-suite (features-kubernetes)	19m 31s
test-suite (features-kubernetes-2)	20m 34s
test-suite (features-variables)	14m 14s
test-suite (services)	13m 56s
test-suite (tasks)	10m 36s
	2h 0m 58s

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