Add e2e test coverage for tests against common providers
As part of the incident review for Incident Review: 500 error when sign-in with SA... (gitlab-com/gl-infra/production#17678 - closed) it was identified that the we can add e2e tests that run against common IdP such as Okta, AD, PingID etc. This task is to create them (or turn into an epic if that's significant effort requiring separate issues)
Edited by Adil Farrukh