chore: modify keycloak healthcheck endpoint for newer keycloak #1385

Job	Run time
test-suite (active-standby-kubernetes)	28m 18s
test-suite (api)	35m 4s
test-suite (deploytarget)	36m 27s
test-suite (features-kubernetes)	35m 0s
test-suite (features-kubernetes-2)	50m 15s
test-suite (features-variables)	33m 8s
test-suite (services)	31m 59s
test-suite (tasks)	27m 29s
	4h 37m 40s

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