Add 2FA check to the OAuth authentication mechanism
Needed for https://gitlab.com/gitlab-org/gitlab-ce/issues/19312
2FA checks were not being performed when logging in via any of the OAuth providers. Just LDAP had the check. This MR fixes that.
See merge request !1976
Prior, if a user had 2FA enabled and checked the "Remember me" field,
the setting was ignored because the OTP input was on a new form and the
value was never passed.
Closes#18000
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Changes:
* Move spec/monkeypatch to spec/support
* Remove unused support/shared_examples
* Move support/api to support/api_helpers to match module name
* Move support/login to support/login_helpers to match module name
* Move API specs to requests/api (convention over configuration)
* Remove unused support/js_patch
* Simplify login_as helper
* Move DatabaseCleaner stuff to its own support file
* Remove unnecessary configuration and requires from spec_helper
