docs: Add more consensus nodes. (matter-labs#2648)

## What ❔

Add more consensus nodes for testnet and mainnet into config example.
Bumps External Node image version in docker example.
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## Why ❔

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## Checklist

<!-- Check your PR fulfills the following items. -->
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- [x] PR title corresponds to the body of PR (we generate changelog
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- [ ] Tests for the changes have been added / updated.
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docs/guides/external-node/docker-compose-examples/mainnet-external-node-docker-compose.yml

@@ -50,7 +50,7 @@ services:
       - POSTGRES_PASSWORD=notsecurepassword
       - PGPORT=5430
   external-node:
-    image: "matterlabs/external-node:2.0-v24.6.0"
+    image: "matterlabs/external-node:2.0-v24.16.0"
     depends_on:
       postgres:
         condition: service_healthy

docs/guides/external-node/docker-compose-examples/testnet-external-node-docker-compose.yml

@@ -50,7 +50,7 @@ services:
       - POSTGRES_PASSWORD=notsecurepassword
       - PGPORT=5430
   external-node:
-    image: "matterlabs/external-node:2.0-v24.6.0"
+    image: "matterlabs/external-node:2.0-v24.16.0"
     depends_on:
       postgres:
         condition: service_healthy

docs/guides/external-node/prepared_configs/mainnet_consensus_config.yaml

@@ -8,3 +8,7 @@ gossip_static_outbound:
     addr: 'external-node-consensus-mainnet.zksync.dev:3054'
   - key: 'node:public:ed25519:b521e1bb173d04bc83d46b859d1296378e94a40427a6beb9e7fdd17cbd934c11'
     addr: 'external-node-moby-consensus-mainnet.zksync.dev:3054'
+  - key: 'node:public:ed25519:45d23515008b5121484eb774507df63ff4ce9f4b65e6a03b7c9ec4e0474d3044'
+    addr: 'consensus-mainnet-1.zksync-nodes.com:3054'
+  - key: 'node:public:ed25519:c278bb0831e8d0dcd3aaf0b7af7c3dca048d50b28c578ceecce61a412986b883'
+    addr: 'consensus-mainnet-2.zksync-nodes.com:3054'

docs/guides/external-node/prepared_configs/testnet_consensus_config.yaml

@@ -8,3 +8,7 @@ gossip_static_outbound:
     addr: 'external-node-consensus-sepolia.zksync.dev:3054'
   - key: 'node:public:ed25519:cfbbebc74127099680584f07a051a2573e2dd7463abdd000d31aaa44a7985045'
     addr: 'external-node-moby-consensus-sepolia.zksync.dev:3054'
+  - key: 'node:public:ed25519:f48616db5965ada49dcbd51b1de11068a27c9886c900d3522607f16dff2e66fc'
+    addr: 'consensus-sepolia-1.zksync-nodes.com:3054'
+  - key: 'node:public:ed25519:3789d49293792755a9c1c2a7ed9b0e210e92994606dcf76388b5635d7ed676cb'
+    addr: 'consensus-sepolia-2.zksync-nodes.com:3054'