Allow creating a new terminal when running python file

[claell]

Environment data

• VS Code version: 1.56.2
• Extension version (available under the Extensions sidebar): v2021.5.842923320
• OS and version: Windows 10
• Python version (& distribution if applicable, e.g. Anaconda): 3.9.5
• Type of virtual environment used (N/A | venv | virtualenv | conda | ...): N/A
• Relevant/affected Python packages and their versions: N/A
• Relevant/affected Python-related VS Code extensions and their versions: N/A
• Value of the python.languageServer setting: XXX

[NOTE: If you suspect that your issue is related to the Microsoft Python Language Server (python.languageServer: 'Microsoft'), please download our new language server Pylance from the VS Code marketplace to see if that fixes your issue]

Expected behaviour

Clicking on the run button runs the file

Actual behaviour

Nothing happens if another file is already running

Steps to reproduce:

[NOTE: Self-contained, minimal reproducing code samples are extremely helpful and will expedite addressing your issue]

1. Run a python file which keeps running (like an API)
2. Open another file (like one sending a request to the API)
3. Try to run it

Logs

Output for Python in the Output panel (View→Output, change the drop-down the upper-right of the Output panel to Python)

XXX