Refactor getNumberOfPassedChecks method

[martinmladenov]

The getNumberOfPassedChecks in CodeChecksResult method currently accepts a boolean.

One way to avoid this boolean would be to offer two methods weightedNumberOfPassedChecks.

See this blog post explaining this Clean Code rule: https://www.informit.com/articles/article.aspx?p=1392524

Originally posted by @mauricioaniche in #210 (comment)

[vesk4000]

I'd love to do this issue

[martinmladenov]

Thanks, I assigned you. Let me know if you have any questions :)