[Run] Show prompt output in run command for test and compile examples

[jan25]

rustlings run test|compile_example should output prompt to remove I AM NOT DONE comment in head of example file, to help users how to proceed to next example.

Unsure the historical reason behind why the run command for compile_example just prints success message and for test_example exits silently. I think we can make its default output similar to watch command.

I saw --nocapture flag to get similar behavior described in this issue, but we can clean that flag and make it a default.

I can reopen earlier PR #1217 if this suggestion make sense.

[manyinsects]

I agree, but this should probably only apply when ran with rustlings run next, as the original purpose of rustlings run is to test solutions out-of-band for a specific exercise. rustlings run next is a fairly recent addition. Would be happy to review a PR for this!

[mo8it]

Should be resolved by the new handling in v6