Build runs dashboard “does not contain” filter no longer crashes

The build-runs dashboard crashed with a 500 error whenever anyone tried to filter runs with the “does not contain” operator on a text field such as Branch, Xcode version, or Gradle version. Both the Xcode and Gradle build-runs views now translate the :!=~ operator to :not_ilike before handing filters to Flop, matching the convention already used by test runs, generate runs, and cache runs. Users can once again apply negative text filters on the builds dashboard without hitting an error.