Migrate term UI to ink

[anerli]

Currently test runner term UI is done with janky logUpdate stuff, we can go back to using ink now that process isolation stuff is resolved

previously had an ink app impl (last version before it was removed in https://github.com/magnitudedev/magnitude/commit/20aefdc6b8614412f5dd9a86776e58e7c1939924) - will require some adaptation now

[ddwang]

Confirming the last impl with Ink was 7bac42b