Open source alternative to reCAPTCHA for GitLab.com registration

See merge request gitlab-org/gitlab-ce!31625

This link is shown when a user tries to login with an unconfirmed
email address and the grace period has expired

With a time treshold of 4 seconds
and a firstname and lastname honeypot
input fields when signing up

Common usages within GitLab QA include Login Page,
navigation bars and layouts

Refactor common Page Objects to use data tags (No. 2 Contd.)

See merge request gitlab-org/gitlab-ce!30763

Snowplow only accepts decimals for value
This MR removes sending of value implicitly with the value attribute

Common usages within GitLab QA include login page, navbars and layouts

In order to break away from using CSS classes as
our primary method of element identification, we
need to provide the ability to search for data
attributes.

Make Test::Sanity::Selectors now work

Utilize regex to match on literal strings of the element name

Suggest the data-qa-selector pattern vs the qa-

Add data-qa-selector to login page to start

We need a page that is heavily used in order to be
confident that this functionality works. Let's start
with the Login page

Use appropriate HAML data tag practices

RecaptchaExperimentHelper contains helper methods
to assist in the controller and view layers.