optimize(healthz): continuously check failed and return failure state (…

…#2781)

Co-authored-by: Yaron Schneider <yaronsc@microsoft.com>
Co-authored-by: Artur Souza <artursouza.ms@outlook.com>

pkg/health/health.go

@@ -64,6 +64,7 @@ func StartEndpointHealthCheck(endpointAddress string, opts ...Option) chan bool
 			if err != nil || resp.StatusCode() != options.successStatusCode {
 				failureCount++
 				if failureCount == options.failureThreshold {
+					failureCount--
 					ch <- false
 				}
 			} else {