[flutter-wizard] Confirmation Instructions

[smeubank]

The wizard is fast and works well, at the end we should be more instructive on what they should do to test errors, tracing and dsym uploads.

it should tell me what to run to test, be very direct with developer run flutter run

or better when there is dsym support, run xyz to upload source maps, THEN run abc to test everything out

ideally the error we inject we tell them about it, and it will have a transaction, like page load, directly associated with it.