feat: include measured score in failure message

[G-Rath]

Fixes #14

[G-Rath]

(it'd be good to have #23 actioned before merging this, just so that releasing it taken care of automatically)

[joshmcarthur]

LGTM, though it has reinforced my belief that we need to do some work around the responsibilities the audit service has so that it's eaiser to access these score results without rerunning the audit.

[robotdana]

i think i'll merge #32 in favour of this unless you have a strong attachment to it, it only runs the audit once

[G-Rath]

I'm not super fussed, other than to point out we could have landed this one as-is then tackled the "run audit once" in another PR since that'll require more review and #32 is currently failing CI, but we know we want this change either way (there's no harm in doing multiple releases either)