Down-weight fuzz targets that have issue(s) with `Fuzz-Blocker` label

Just a random thought, feel free to close. We have some logic in `update_fuzz_blocker_label` that would add a `Fuzz-Blocker` label to crashes that happen way too often and block the progress of a particular fuzz target. Can we (or do we) down-weight the targets that have such issues, as they are essentially wasting cycles until fuzz blockers get fixed?