fix: remove gasLimit overrides for rootstock/rootstocktestnet (#247)

### Description

fix: remove gasLimit overrides for rootstock/rootstocktestnet

hardcoding the gaslimit this high causes problems in the relayer, as it
will want the IGP payment to cover this limit. if the gas limit is set
to the block gas limit, this is likely never going to happen. so we
remove the overrides.

note, the overrides have been removed in the recently deployed agent
configs. this is to update the default registry metadata to match our
deployed agent setup.

### Backward compatibility

y

### Testing

manual

.changeset/honest-points-smoke.md

@@ -0,0 +1,5 @@
+---
+'@hyperlane-xyz/registry': patch
+---
+
+Remove gasLimit override for rootstock and roostocktestnet

chains/metadata.yaml

@@ -2826,8 +2826,6 @@ rootstock:
     - http: https://rpc.mainnet.rootstock.io/kXhXHf6TnnfW1POvr4UT0YUvujmuju-M
     - http: https://public-node.rsk.co
     - http: https://mycrypto.rsk.co
-  transactionOverrides:
-    gasLimit: 6800000
 rootstocktestnet:
   blockExplorers:
     - apiUrl: https://rootstock-testnet.blockscout.com/api
@@ -2853,8 +2851,6 @@ rootstocktestnet:
   protocol: ethereum
   rpcUrls:
     - http: https://rpc.testnet.rootstock.io/YZIZHxGCQAryubOWH7LjdtjNkSDb5J-T
-  transactionOverrides:
-    gasLimit: 6800000
 saakuru:
   blockExplorers:
     - apiUrl: https://explorer.saakuru.network/api

chains/rootstock/metadata.yaml

@@ -29,7 +29,3 @@ rpcUrls:
   - http: https://rpc.mainnet.rootstock.io/kXhXHf6TnnfW1POvr4UT0YUvujmuju-M
   - http: https://public-node.rsk.co
   - http: https://mycrypto.rsk.co
-transactionOverrides:
-  # Maximum gas the operation can afford. It's an upper limit the user sets to prevent losing gas.
-  # Reference: https://dev.rootstock.io/concepts/rbtc/gas/
-  gasLimit: 6800000

chains/rootstocktestnet/metadata.yaml

@@ -26,5 +26,3 @@ rpcUrls:
   # Recommended way is to get a new APIKEY whoever wants to run Hyperlane on Rootstock.
   # RPC API Dashboard: https://dashboard.rpc.rootstock.io
   - http: https://rpc.testnet.rootstock.io/YZIZHxGCQAryubOWH7LjdtjNkSDb5J-T
-transactionOverrides:
-  gasLimit: 6800000