Make "detected_host_os()" available on the SLAVE side of the split keyboard (#19854)

Co-authored-by: ngs.ch <ngs.ch>
Co-authored-by: Drashna Jaelre <[email protected]>

quantum/split_common/transaction_id_define.h

@@ -113,6 +113,10 @@ enum serial_transaction_id {
     SPLIT_TRANSACTION_IDS_USER,
 #endif // SPLIT_TRANSACTION_IDS_USER
 
+#if defined(OS_DETECTION_ENABLE) && defined(SPLIT_DETECTED_OS_ENABLE)
+    PUT_DETECTED_OS,
+#endif // defined(OS_DETECTION_ENABLE) && defined(SPLIT_DETECTED_OS_ENABLE)
+
     NUM_TOTAL_TRANSACTIONS
 };