Use “does not contain” filters on build-runs dashboards without errors

The build-runs dashboard no longer crashes when you filter text fields, such as Branch or Xcode/Gradle version, using the “does not contain” operator. Previously, this selection caused a 500 error because the dashboard sent an unrecognized filter operator to the backend. Now the operator is translated correctly for both Xcode and Gradle build runs, so the filter applies as expected.