Revert "Use traces to extract the input for settlement::Observer (#… (

#3237)

# Description
Reverts #3233

None of the Arbitrum nodes supports `trace_transaction`. Supposedly,
`arbtrace_transaction` should be used instead, but I couldn't make it
work.

Also, not all backup nodes (read alchemy) for other networks (base, gc)
support `trace_transaction`. I noticed that alchemy supports
`debug_traceTransaction` that could be used instead.

Overall, I should have checked this before merging the PR. I decided to
revert this PR since, right now, Arbitrum staging is unable to work
properly, and also, even with specific/per_chain implementation I am not
sure I will be able to make it work with all PRIMARY/BACKUP nodes on ALL
networks. This needs throughout testing first.

crates/autopilot/src/domain/eth/mod.rs

@@ -312,20 +312,15 @@ pub struct TradeEvent {
     pub order_uid: domain::OrderUid,
 }
 
-/// A trace of a Call type of action.
-#[derive(Debug, Clone, Default)]
-pub struct TraceCall {
-    pub to: Address,
-    pub input: Calldata,
-}
-
 /// Any type of on-chain transaction.
 #[derive(Debug, Clone, Default)]
 pub struct Transaction {
     /// The hash of the transaction.
     pub hash: TxId,
     /// The address of the sender of the transaction.
     pub from: Address,
+    /// The call data of the transaction.
+    pub input: Calldata,
     /// The block number of the block that contains the transaction.
     pub block: BlockNo,
     /// The timestamp of the block that contains the transaction.
@@ -334,6 +329,4 @@ pub struct Transaction {
     pub gas: Gas,
     /// The effective gas price of the transaction.
     pub gas_price: EffectiveGasPrice,
-    /// Traces of all Calls contained in the transaction.
-    pub trace_calls: Vec<TraceCall>,
 }