Test all measure definition pages load without error
Test all measure definition pages load without error

There's a bit of nastiness here to get the measures to import but it's
fairly self-contained and I think worth it if it prevents us
accidentally breaking one of the measure definition pages.

ebmdatalab/openprescribing,annapowellsmith/openpresc,annapowellsmith/openpresc,ebmdatalab/openprescribing,ebmdatalab/openprescribing,annapowellsmith/openpresc,annapowellsmith/openpresc,ebmdatalab/openprescribing