Enhance error handling and platform-specific command execution in Pyt…

…hon executor

hstest/testing/execution/process/python_executor.py

@@ -1,5 +1,7 @@
 from __future__ import annotations
 
+import os
+import sys
 from hstest.testing.execution.process_executor import ProcessExecutor
 from hstest.testing.execution.searcher.python_searcher import PythonSearcher
 
@@ -9,4 +11,9 @@ def __init__(self, source_name: str | None = None) -> None:
         super().__init__(PythonSearcher().find(source_name))
 
     def _execution_command(self, *args: str):
-        return ["python", "-u", self.runnable.file, *list(args)]
+        cmd = ["python"]
+        if sys.platform == 'win32':
+            # Set UTF-8 encoding for stdin/stdout on Windows
+            cmd.extend(["-X", "utf8"])
+        cmd.extend(["-u", self.runnable.file, *list(args)])
+        return cmd