Terminal shouldn't be focused if file cannot be run

[injust]

Behaviour

The "Python: Run Python File" commands focus the terminal unnecessarily if the file cannot be run.

Steps to reproduce:

1. Enable "Python › Terminal: Focus After Launch" (python.terminal.focusAfterLaunch)
2. Create an unsaved Python file or a saved non-Python file
3. Run the "Python: Run Python File" command
4. You get the error message "The active file needs to be saved before it can be run" or "The active file is not a Python source file", but the terminal still becomes focused

[injust]

#24396 is the root cause of this. See that issue for more details.