[metrics-server] Set resources requests/limits on metrics-server container

The upstream metrics-server chart ships with limits commented out
(requests cpu 100m / memory 200Mi only), which triggers a 'no CPU
limit' conformance warning. Override the package values.yaml to keep
the upstream-recommended baseline requests and add limits 500m/500Mi
— comfortable headroom on top of the official sizing formula
(100m + 1m/node, 200Mi + 2Mi/node), covering clusters up to ~150 nodes
without needing to revisit.

Signed-off-by: Matthieu <matthieu@hidora.com>

packages/system/metrics-server/values.yaml

@@ -12,4 +12,12 @@ metrics-server:
   serviceMonitor:
     enabled: true
 
+  resources:
+    limits:
+      cpu: 500m
+      memory: 500Mi
+    requests:
+      cpu: 100m
+      memory: 200Mi
+