fix: prevent health check from surpressing traces

Stack traces aren't logged when a health check failure occurs. This was
caused by interfacing with AlarmService directly instead of using the
error service.

src/backend/src/modules/core/ServerHealthService.js

@@ -172,6 +172,8 @@ class ServerHealthService extends BaseService {
                         { error: err }
                     );
                     check_failures.push({ name });
+                    
+                    this.log.error(`Error for healthcheck fail on ${name}: ` + e.stack);
 
                     // Run the on_fail handlers
                     for ( const fn of chainable.on_fail_ ) {