feat: add panels for eth_getProof in grafana dashboard (#392)

Closes #318 

<img width="2208" height="672" alt="Screenshot 2025-11-21 at 15 35 16"
src="https://github.com/user-attachments/assets/62ba3b36-fd4f-498a-9bbc-7e4f33c9e3d2"
/>


The OP-Reth dashboard is not loaded by default when running the kurtosis
devnet for e2e historical proofs. Once #391 is merged, I'll update the
devnet config to load it by default.

Author: itschaindev

crates/optimism/tests/devnets/opgeth-seq-opreth-val.yaml

@@ -3,6 +3,12 @@
 # One with op-geth/op-node (sequencer role) and one with op-reth/op-node (verifier role).
 
 optimism_package:
+  observability:
+    enabled: true
+    grafana_params:
+      # Will load the dashboards from default branch.
+      dashboard_sources:
+        - github.com/op-rs/op-reth/etc/grafana
   faucet:
     enabled: true
   test-sequencers:

crates/optimism/tests/devnets/opreth-seq-opgeth-val.yaml

@@ -3,6 +3,12 @@
 # One with op-geth/op-node (verifier role) and one with op-reth/op-node (sequencer role).
 
 optimism_package:
+  observability:
+    enabled: true
+    grafana_params:
+      # Will load the dashboards from default branch.
+      dashboard_sources:
+        - github.com/op-rs/op-reth/etc/grafana
   faucet:
     enabled: true
   test-sequencers: