fix roctx range markers not paired correctly in rocpd output (#2793)

## Motivation

Fix roctx range markers (Push/Pop, Start/Stop) not being displayed correctly in rocpd output. The Visualizer was showing only Stop/Pop events as instant markers instead of proper duration ranges with labels, while Perfetto output displayed them correctly.

## Technical Details

In `tool_tracing_callback_stop()`, the rocpd/database output was using `user_data->value` (timestamp of the Pop/Stop event) instead of `begin_ts` (corrected timestamp from the corresponding Push/Start event) when calling `cache_region()`.

The Perfetto output already used `begin_ts` correctly (line 818). This change aligns the rocpd output with the Perfetto behavior by using `begin_ts` instead of `user_data->value` (line 887).

Updated rocpd validation rules

projects/rocprofiler-systems/source/lib/rocprof-sys/library/rocprofiler-sdk.cpp

@@ -884,7 +884,7 @@ tool_tracing_callback_stop(
         record, iterate_args_callback, 2, &args);
 
     auto     call_stack = get_backtrace(_bt_data);
-    uint64_t _beg_ts    = user_data->value;
+    uint64_t _beg_ts    = begin_ts;
     uint64_t _end_ts    = ts;
 
     {