Background: We want to display bugs of a flake and culprits the flake analyzer has found for that flake on the flake occurrence page.

Current implementation: Currently using the bug_id saved in a flake (idea is to file a bug for each flake) to query all the flake analyses, and get all culprits from the analyses.

Expected changes: after we change to maintain a bug for each culprit, we can directly query culprits using the bug_id(s) from a flake, no need to query flake analyses any more.