Improve warnings when ignoring preview rules without preview flag #7491
Description
ruff check --isolated --ignore PLC1901,PLR0904 # version 0.0.290outputs
warning: Selection of nursery rule `PLC1901` without the `--preview` flag is deprecated.
warning: Selection `PLR0904` has no effect because the `--preview` flag was not included.
I think these warnings are rather irrelevant - they basically confirm what the users wants to do anyway, which is not select these rules.