Changes to selenium AxeReporter

[Sereza7]

• Added a parameter to display help tips
• factorized string building
• Added a secondary signature to call getReadableAxeResults without a WebDriver

The secondary signature makes it so that the axe report can be computed after the test itself.

[CLAassistant]

All committers have signed the CLA.

[Zidious]

Hey @Sereza7!

Thanks! Missed this, will get with the team and review shortly

[michael-siek]

Hi @Sereza7 do you mind adding unit test to this?

[Zidious]

Hey @Sereza7 - Just wanted to catch up, looks like the test is failing

[Zidious]

Closing due to inactivity - please feel free to reopen when you get the time