1905930 - Filling alert bug should only use test names that regressed in bug title

Status: NEW

(Tree Management :: Perfherder, defect, P2)

Description

[Greg Mierzwinski [:sparky]]

Alert bugs that are filed from the file bug modal in perfherder assume that all the tests that alert are regressions, but that's not always the case. In some cases, improvements are also included. This can lead to the bug title being misleading where a test which improves is mentioned as regressing like in bug 1904545. When selecting a test from a set of alerts, we don't verify that the test regressed, and this should be fixed: https://github.com/mozilla/treeherder/blob/bc6850374c4c403cafc2fcca599e3c280d3072b3/ui/perfherder/perf-helpers/helpers.js#L550