Revert signature-notification format change (#12032)

* Use untagged RpcSignatureResult enum to avoid breaking downstream consumers of current signature subscriptions

* Clean up client duplication

* Clippy

client/src/rpc_response.rs

@@ -94,11 +94,18 @@ pub struct RpcKeyedAccount {
     pub account: UiAccount,
 }
 
+#[derive(Serialize, Deserialize, Clone, Copy, Debug, PartialEq)]
+pub struct SlotInfo {
+    pub slot: Slot,
+    pub parent: Slot,
+    pub root: Slot,
+}
+
 #[derive(Serialize, Deserialize, Clone, Debug)]
-#[serde(rename_all = "camelCase", tag = "type", content = "result")]
+#[serde(rename_all = "camelCase", untagged)]
 pub enum RpcSignatureResult {
-    ProcessedSignatureResult(ProcessedSignatureResult),
-    ReceivedSignature,
+    ProcessedSignature(ProcessedSignatureResult),
+    ReceivedSignature(ReceivedSignatureResult),
 }
 
 #[derive(Serialize, Deserialize, Clone, Debug)]
@@ -107,6 +114,12 @@ pub struct ProcessedSignatureResult {
     pub err: Option<TransactionError>,
 }
 
+#[derive(Serialize, Deserialize, Clone, Debug)]
+#[serde(rename_all = "camelCase")]
+pub enum ReceivedSignatureResult {
+    ReceivedSignature,
+}
+
 #[derive(Serialize, Deserialize, Clone, Debug)]
 pub struct RpcContactInfo {
     /// Pubkey of the node as a base-58 string