954 - Add tests coverage

What was done

update coverage package (jsdevtools/coverage-istanbul-loader is more up to date, at least it works with webpack5)
ignore /coverage dir
5k diff in package-lock.json, because coverage reporter uses babel heavily
integrate coverage lib in cypress code

:warning: There is a bug when parsing code, that has coverage-helper-code. More specifically, aurelia-validation does not parse the helper code correctly https://github.com/aurelia/testing/issues/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)

Testing

(note, the section below is from the updated README Have to run a separate command to instrument the code (instrument = add helper code, that tracks when code was executed) npm run start-dev:cov

Then can run other e2e commands

PrimeDAO / prime-deals-dapp

954 - Add tests coverage #977

What was done

Testing

Before

After