Show file pattern prompt for pytest

[karthiknadig]

Environment data

• VS Code version: 1.34.0
• Extension version (available under the Extensions sidebar): 2019.6.16302-dev
• OS and version: windows
• Python version (& distribution if applicable, e.g. Anaconda): 3.7
• Type of virtual environment used (N/A | venv | virtualenv | conda | ...): N/A
• Relevant/affected Python packages and their versions: pytest

Expected behaviour

Should show this prompt for pytest

Actual behaviour

Does not show prompt to select file pattern for pytest

Steps to reproduce:

1. Follow prompts for Python: Configure Tests.
2. Select pytest (does not get file pattern prompt)
3. Select unittest (you will see file pattern prompt)

[luabud]

we could prompt this if they don't have a pytest.ini file

[eleanorjboyd]

this flow would be impacted by: #21845

[karthiknadig]

I don't think we are doing this given the different format we use to run tests now.

[eleanorjboyd]

We will be making changes to the setup flow as we switch to using distinct configs for run, discovery, and debug so changes there will also impact how this looks

[karthiknadig]

Remember we decided that we are not going to support "**" in the pytest args as pytest itself does not give us an API for it. unittest has the pattern API for this.