ICM fixes (3/n) (#27925)

### Description
Fix ICM issue:
https://portal.microsofticm.com/imp/v5/incidents/details/31000000567822/summary

The ICM is mainly about 2 issues in `validate_package.py` which was
fixed by #27840.
But the ICM also references another issue in `whisper_jump_times.py`
which is what this PR fixes

### Motivation and Context
ICM fixes

Author: hariharans29

onnxruntime/python/tools/transformers/models/whisper/whisper_jump_times.py

@@ -6,6 +6,8 @@
 
 import logging
 import os
+import subprocess
+import sys
 import tempfile
 import textwrap
 from pathlib import Path
@@ -201,9 +203,9 @@ def create_torch_ops(self):
             assert torch.utils.cpp_extension.verify_ninja_availability()
         except Exception as e:
             logger.error(f"An error occurred while verifying `ninja` is available: {e}", exc_info=True)  # noqa: G201
-            install_cmd = "pip install ninja"
-            logger.warning(f"Could not import `ninja`. Attempting to install `ninja` via `{install_cmd}`.")
-            os.system(install_cmd)
+            install_cmd = [sys.executable, "-m", "pip", "install", "ninja"]
+            logger.warning("Could not import `ninja`. Attempting to install `ninja` via `%s`.", " ".join(install_cmd))
+            subprocess.run(install_cmd, check=True)
 
         # Create UnfoldTensor torch op
         unfold_op_source = textwrap.dedent("""\