chore: modify keycloak healthcheck endpoint for newer keycloak #1443

Job	Run time
test-suite (active-standby-kubernetes)	20m 15s
test-suite (api)	25m 46s
test-suite (deploytarget)	25m 32s
test-suite (features-kubernetes)	25m 55s
test-suite (features-kubernetes-2)	26m 47s
test-suite (features-variables)	23m 3s
test-suite (services)	22m 4s
test-suite (tasks)	19m 53s
	3h 9m 15s

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