chore: modify keycloak healthcheck endpoint for newer keycloak #1440

Job	Run time
test-suite (active-standby-kubernetes)	20m 16s
test-suite (api)	26m 15s
test-suite (deploytarget)	19m 15s
test-suite (features-kubernetes)	25m 32s
test-suite (features-kubernetes-2)	32m 19s
test-suite (features-variables)	22m 23s
test-suite (services)	21m 31s
test-suite (tasks)	19m 43s
	3h 7m 14s

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