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

opentelemetry-collector/helm-values.yaml

@@ -28,7 +28,7 @@ resources:
     cpu: 25m
     memory: 64Mi
   limits:
-    memory: 256Mi
+    memory: 64Mi
 
 # =============================================================================
 # Tolerations (run on all nodes including master)