Stop signature matching for fixed buckets. #1120
Description
When a bucket is linked to a bug and that bug is fixed, after a grace period (CLEANUP_FIXED_BUCKETS_AFTER_DAYS), we delete that bucket and all contained crashes. This creates a window of time where the bucket still exists (in case we need info for the bug, or the fix is incomplete).
We should have a way to stop using a bucket for incoming crashes without deleting it. This would allow us to see new crashes having the same symptoms after the fix apparently landed. We should account for currently running pools which may continue to report from revisions without the fix. (ie. use a "fixed-by" revision or build id and only disable matching for reports from newer builds).