Improve `fail_login` message for GroupSAML
Why
There are quite a few user flows that hit this so it might be worth additional thought
What
The following discussion from !8008 (merged) should be addressed:
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@jamedjo started a discussion: Possible messages:
"Which GitLab account to you want to use with #{@unauthenticated_group.name}?"
"You'll need a GitLab account to use with #{@unauthenticated_group.name}, register or sign in"
"No associated GitLab account found for #{@unauthenticated_group.name}, register or sign in"