[perf] fix: the overwritten of Torch_profile with multi steps. (#5395)

### What does this PR do?

> When using PyTorch Profiler for multi-step performance analysis, the
performance analysis files generated by different steps will overwrite
each other in discrete mode, resulting in only the analysis data from
the last step being retained. This PR fix this bug by adding timestamp
in the file_name. Issue is:
#5387.

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Effect: 
<img width="326" height="99" alt="torch_profile_pic3"
src="https://github.com/user-attachments/assets/7524f1dd-82ac-45b7-82fc-50a2b987591b"
/>



### API and Usage Example

> Demonstrate how the API changes if any, and provide usage example(s)
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```python
# Add code snippet or script demonstrating how to use this
# Add time stampe in save_file_name
current_time = datetime.now(tz=timezone.utc).astimezone()
timestamp = current_time.strftime("%Y%m%d%H%M%S%f")[:-3]
```

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Author: Rhetee

verl/utils/profiler/torch_profile.py

@@ -14,6 +14,7 @@
 
 import functools
 import os
+from datetime import datetime, timezone
 from typing import Callable, Optional
 
 import torch
@@ -34,7 +35,11 @@ def get_torch_profiler(
 
     os.makedirs(save_path, exist_ok=True)
 
-    save_file_name = f"prof_rank-{rank}.json.gz"
+    current_time = datetime.now(tz=timezone.utc).astimezone()
+    timestamp = current_time.strftime("%Y%m%d%H%M%S%f")[:-3]
+    pid = os.getpid()
+
+    save_file_name = f"prof_rank-{rank}_{pid}_{timestamp}.json.gz"
     if save_file_prefix:
         save_file_name = f"{save_file_prefix}_{save_file_name}"
     save_path = os.path.join(save_path, save_file_name)