feat(router): modify attempt_id generation logic to accommodate payment_id as prefix (#1596)

crates/router/src/utils.rs

@@ -150,3 +150,8 @@ pub fn to_currency_base_unit_asf64(
     };
     Ok(amount)
 }
+
+#[inline]
+pub fn get_payment_attempt_id(payment_id: impl std::fmt::Display, attempt_count: i16) -> String {
+    format!("{payment_id}_{attempt_count}")
+}