fix(gateway): remove invalid liveness indicator

- `diskSpaceHealthIndicator` was not available but was silently ignored in spring boot <3.1.0
- see spring-projects/spring-boot#34360
- disk indicator is not needed for gateway liveness

dist/src/main/resources/application-gateway.properties

@@ -7,6 +7,5 @@ management.endpoint.health.group.startup.show-details=never
 management.endpoint.health.group.readiness.include=gatewayStarted
 management.endpoint.health.group.readiness.show-details=never
 management.endpoint.health.group.liveness.include=livenessGatewayResponsive,\
-  livenessGatewayClusterAwareness,livenessGatewayPartitionLeaderAwareness,livenessMemory,\
-  diskSpaceHealthIndicator
+  livenessGatewayClusterAwareness,livenessGatewayPartitionLeaderAwareness,livenessMemory
 management.endpoint.health.group.liveness.show-details=always