Add methods.disabled to beacon-chain upstreams for expensive state dumps

Disable GET#/eth/v2/debug/beacon/states/*, GET#/eth/v1/beacon/states/*/committees,
GET#/eth/v1/beacon/states/*/validators, and POST#/eth/v1/beacon/states/*/validators
which produce multi-GB responses that timeout at the gateway.

These were applied live on hosts 2026-08-31 (rob, operator-approved) but existed
nowhere durable. Baking them in at the source prevents regeneration from
erasing them.

Affects all ethereum and gnosis beacon-chain upstreams.

Generated by Mistral Vibe.
Co-Authored-By: Mistral Vibe <vibe@mistral.ai>

gnosis/reth/gnosis-mainnet-reth-pruned-trace.yml

@@ -190,6 +190,12 @@ x-upstreams:
       # UNAVAILABLE and failing live requests ("Source was empty"). Head tracking
       # still governs health with validation off. 2026-07-10, dRPC incident.
       disable-validation: true
+    methods:
+      disabled:
+        - name: GET#/eth/v2/debug/beacon/states/*
+        - name: GET#/eth/v1/beacon/states/*/committees
+        - name: GET#/eth/v1/beacon/states/*/validators
+        - name: POST#/eth/v1/beacon/states/*/validators
     connection:
       generic:
         rpc: