Test: Improve experience when an invalid Python interpreter is selected

[karrtikr]

Refs: #19174

• anyOS @sandy081
• anyOS @rchiodo

Complexity: 5

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Requirements:

• Pre-release version of the Python extension installed

Steps:

Intention is to verify no error prompts show up at startup, and only show up when user manually attempts to use a feature of an extension which requires an interpreter:

• Select an invalid interpreter. You can use Python: Select Interpreter command and choose Enter interpreter path... item.
• Verify prompt shows up.
• Reload window.
• Open a Python file to activate the extension. Verify no error prompts show up at startup.
• Verify the following warning with appropriate theme color appears in the status bar:
  
• Try using any feature of the Python extension which requires a Python interpreter, and verify that the prompt to select interpreter shows up. Some of the important ones to verify:
  • Running python files in:
    • Terminal: Play icon on top right
    • REPL (Shift + Enter)
  • Debugging
  • Refactoring. For eg. "Sort Imports"
  • Linting
    
  • Any Python: ... commands requiring an interpreter or anything in the context menu

[rchiodo]

Not sure but it seems like the 'Hey this interpreter is bad' question is cached and also not shown before an action is run.

[rchiodo]

Nope, my bad. I had the old extension installed.