Add --ignore flag to test command

Editor assessment

Add --ignore flag to test command is a complete feature statement: the flag, its command, and its effect are all identifiable from the subject alone. The cli scope and feat type are accurate, the phrasing is imperative and short, and the change is small enough that a body would merely restate it, so absence is justified. No footer is required. Clean, correct, and publishable as a small feature example. Nothing else is needed: the flag, the command, and the effect are the whole change, and all three are present.