op-node: default OP_NODE_L2_ENGINE_RPC_TIMEOUT=120s for all OP-stack nodes

op-node's default engine-API RPC timeout is short; on nodes whose EL responds
slowly to engine_newPayload/forkChoiceUpdated (e.g. boba-mainnet op-reth pruned
during catch-up) op-node times out driving the EL and the execution head freezes
while op-node keeps deriving from L1. Raising the engine RPC timeout to 120s
prevents this class of stall fleet-wide.

Regenerated from env/op/node.env: adds the env var to every op-node service
(116 geth + 40 reth + 22 erigon composes); additions only, no other changes.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

op/geth/mode-mainnet-op-geth-pruned-pebble-hash.yml

@@ -120,6 +120,7 @@ services:
       - OP_NODE_L1_TRUST_RPC=${ETHEREUM_MAINNET_EXECUTION_TRUST:-false}
       - OP_NODE_L2_ENGINE_AUTH=/jwtsecret
       - OP_NODE_L2_ENGINE_RPC=http://mode-mainnet:8551
+      - OP_NODE_L2_ENGINE_RPC_TIMEOUT=120s
       - OP_NODE_L2_SKIP_SYNC_START_CHECK=true
       - OP_NODE_LOG_LEVEL=info
       - OP_NODE_METRICS_ADDR=0.0.0.0