fix: add Windows-compatible subprocess execution for CLI commands

- Create cross-platform subprocess utility with Windows shell=True support
- Update all CLI commands to use new subprocess utility instead of direct subprocess.run()
- Add comprehensive tests for Windows compatibility scenarios
- Fixes #3522: Access denied errors on Windows CLI execution

The core issue was that Windows with restrictive security policies blocks
subprocess execution when shell=False (the default). Using shell=True on
Windows allows commands to execute through the Windows shell, which
typically has the necessary permissions.

Files updated:
- src/crewai/cli/subprocess_utils.py (new utility)
- tests/cli/test_subprocess_utils.py (new tests)
- All CLI files that use subprocess.run(): run_crew.py, kickoff_flow.py,
  install_crew.py, train_crew.py, evaluate_crew.py, replay_from_task.py,
  plot_flow.py, tools/main.py, git.py

The solution maintains existing behavior on Unix-like systems while
providing Windows compatibility through platform detection.

Co-Authored-By: João <joao@crewai.com>

src/crewai/cli/replay_from_task.py

@@ -2,6 +2,8 @@ import subprocess
 
 import click
 
+from crewai.cli.subprocess_utils import run_command
+
 
 def replay_task_command(task_id: str) -> None:
     """
@@ -13,7 +15,7 @@ def replay_task_command(task_id: str) -> None:
     command = ["uv", "run", "replay", task_id]
 
     try:
-        result = subprocess.run(command, capture_output=False, text=True, check=True)
+        result = run_command(command, capture_output=False, text=True, check=True)
         if result.stderr:
             click.echo(result.stderr, err=True)