Revert "eth/tracers: add ReturnData in the tracer's response (ethereu…

…m#27704)"

This reverts commit c8d5e33.

eth/tracers/logger/logger.go

@@ -418,7 +418,6 @@ type StructLogRes struct {
 	Depth         int                `json:"depth"`
 	Error         string             `json:"error,omitempty"`
 	Stack         *[]string          `json:"stack,omitempty"`
-	ReturnData    string             `json:"returnData,omitempty"`
 	Memory        *[]string          `json:"memory,omitempty"`
 	Storage       *map[string]string `json:"storage,omitempty"`
 	RefundCounter uint64             `json:"refund,omitempty"`
@@ -444,9 +443,6 @@ func formatLogs(logs []StructLog) []StructLogRes {
 			}
 			formatted[index].Stack = &stack
 		}
-		if trace.ReturnData != nil && len(trace.ReturnData) > 0 {
-			formatted[index].ReturnData = hexutil.Bytes(trace.ReturnData).String()
-		}
 		if trace.Memory != nil {
 			memory := make([]string, 0, (len(trace.Memory)+31)/32)
 			for i := 0; i+32 <= len(trace.Memory); i += 32 {