Extend multi-step user input lib to support selection lists

[maninak]

Previously we developed a utility called askUser() allowing us to create multi-step text user inputs.

While the current solution wraps the native InputBox API, it still doesn't support the native QuickPick API which lets the user pick an item from a list of items. Without it, we cannot augment the UX of our Troubleshooting flow (going back to select another answer, cleaner code, etc) and we also won't have it ready to use when we'll definitely need it in the future.

Luckily the existing architectural design already accounts for this future expansion (in reality development of the feature was cut short due to time constraints).

Acceptance Criteria:

1. askUser() accepts Question definitions where kind can additionally have the value 'single-select' or 'multi-select' corresponding to the QuickPick.canSelectMany option
2. existing uses of the QuickPick API across the codebase are replaced with askUser()