CHORE(resources): set memory limits equal to memory requests

Align memory limits with memory requests for guaranteed QoS class.
- prometheus, thanos (query, storegateway, compactor)
- alertmanager, tempo, goldilocks (dashboard, controller)
- node-exporter, opentelemetry-collector, vpa, kube-state-metrics

alertmanager/helm-values.yaml

@@ -26,7 +26,7 @@ resources:
     cpu: 15m
     memory: 100Mi
   limits:
-    memory: 150Mi
+    memory: 100Mi
 
 # Disable default config - use secret instead
 config: