Add support for Chrome Beta

[chrisbreiding]

As a corollary to #3096, in order to test Cypress itself in Chrome Beta, Cypress needs to support detecting and running tests in Chrome Beta. This will enable all users to test with Chrome Beta.

[cypress-bot]

The code for this is done in cypress-io/cypress#16518, but has yet to be released.
We'll update this issue and reference the changelog when it's released.