On Ubuntu enterprise 2004:

• external_auth_oidc_azure
• external_auth_oidc_gcp

On essentially every variant:

• external_auth
• external_auth_aws

As part of SERVER-83032 we removed the above tests for release variants. These need to be added back for the following reasons
external_auth includes LDAP tests which involves quite a few different integration points and possible libraries that are linked against the server, so we want to run this against as many variants as we can (though AFAIK this could be just all enterprise variants).Similar story for external_auth_aws as it has quite a broad integration profile, lots of ways to configure and utilize the functionality those tests exercise

We need ubuntu because some packages our test uses out of the box (firefox webdriver / selenium) so its easier to run. Also easy to install the gcp CLI through apt.