Support Microsoft attribute names

Microsoft Azure SAML integration by default uses attribute names with a URL style: http://schemas.microsoft.com/ws/2008/06/identity/claims/emailaddress. Currently, GitLab.com only supports attribute names like mail or email per https://docs.gitlab.com/ee/user/group/saml_sso/#user-attributes. Self-managed GitLab is the same by default but is configurable: https://docs.gitlab.com/ee/integration/saml.html#configure-assertions.

Both self-managed and SaaS should ideally support these common attribute names by default. The name values are documented at https://learn.microsoft.com/en-us/dotnet/api/system.security.claims.claimtypes?view=net-7.0. The ones we really need to be concerned with are first name (given name), last name (surname), username and email address.

We can make this change in Gitlab::Auth::Saml::AuthHash and override the parent class methods like name and email and use an OR statement. The following is what I expect will work but is untested.

override :email  
def email
  super || get_info('http://schemas.microsoft.com/ws/2008/06/identity/claims/emailaddress')
end