[Version-unspecific] Report how many regression tests have been completed so far

[Version-unspecific]

Intended to close #1821 (closed)
'Regression tests don't yet report how many have been completed so far'.

Includes miscellaneous cleanup commits mentioned in the Issue;
as always, feedback is welcome.

The main effect can be seen at this MR's
https://gitlab.com/thorchain/thornode/-/jobs/5884214085
in the form of the '[number]/60 regression tests completed' log lines.