Update existing E2E tests for SAML with enforced SSO to include group URL
As part of the incident review we identified that our existing E2E tests for SAML with enforced SSO use the full URL to login and not the shorter https://gitlab.com/<groupname>
often bookmarked by users. This would have have helped by a test failure when they were not redirected correctly.
This task is to extend the test coverage to include that scenario.