Revert putting fetch of interest_bearing_config in the background pool

rpc/src/rpc.rs

@@ -1993,22 +1993,10 @@ impl JsonRpcRequestProcessor {
             Error::invalid_params("Invalid param: mint could not be unpacked".to_string())
         })?;
 
-        let interest_bearing_config = OptionFuture::from(
-            mint.get_extension::<InterestBearingConfig>()
-                .map(|interest_bearing_config| {
-                    let bank = Arc::clone(&bank);
-                    async move {
-                        let unix_timestamp = self
-                            .runtime
-                            .spawn_blocking(move || bank.clock().unix_timestamp)
-                            .await
-                            .expect("Failed to spawn blocking task");
-                        (*interest_bearing_config, unix_timestamp)
-                    }
-                })
-                .ok(),
-        )
-        .await;
+        let interest_bearing_config = mint
+            .get_extension::<InterestBearingConfig>()
+            .map(|x| (*x, bank.clock().unix_timestamp))
+            .ok();
 
         let supply = token_amount_to_ui_amount_v2(
             mint.base.supply,