Run JavaScript and Cucumber tests
Run JavaScript and Cucumber tests

These were accidentally removed in the switch to
[native parallelisation](https://github.com/alphagov/whitehall/pull/6244).
See https://github.com/alphagov/whitehall/pull/6244/commits/e34ad54761e74795b94a934b9b41f57b1720f3ad#diff-02ae33fe846ac6852102d8ed2adbed8c908b33c85b2413164001e52869f96d56L11

alphagov/whitehall,alphagov/whitehall,alphagov/whitehall,alphagov/whitehall