Tests: Code instrumentation breaks aurelia-validation package

[hiaux0]

Discovered in PR 954

⚠️ There is a bug when parsing code, that has coverage-helper-code.
More specifically, aurelia-validation does not parse the helper code correctly aurelia/testing#94.
I found a fix, but would need to PR to the aurelia repo and stuff.
(Maybe we just fork ourselves, will create a ticket)

A fix I found is to update the parts of the regex

- $_\s\w\d\/\*.['"\]+;
+ $_\s\w\d\/\*.['"\]+();

Reported to package in question
aurelia/validation#571