Add the waveforms check to the C.I.

Part of the bilby review, suggested by @matthew-pitkin, was to do a check that the waveforms produced by the bilby waveform generator are "correct".

Link to the review wiki page

In the review, we compared against pycbc and we had agreement that, for IMRPhenomPv2 and IMRPhenomD_NRT things where sufficiently good. However, Matt recommended we eventually move this test into the C.I. to make results robust against changes in the waveform. This issue has been created to track progress on this.