For notification rules, the absence of a value on a 'highlight' tweak means
that the highlight should happen; this was previously confusing us.
Use the action parser from NotificationUtils to simplify the code.
Fixes https://github.com/vector-im/vector-web/issues/1330
* Make sure we only get one js-sdk (and update runtime config to match)
* Don't verifyNoOutstandingRequests (since it is hard to be certain which we
will get, and makes the tests too dependent on implementation-specifics).
* Disable color for npm test, to avoid confusing Jenkins