SAML Group Sync should include Minimal Access at top-level
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### Release notes
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### Problem to solve
When using [SAML Group Sync, we warn users](https://docs.gitlab.com/ee/user/group/saml_sso/#group-sync) that users not in a group will be removed. The current solution at the top-level is to have everyone in at least 1 group. However, Minimal Access is not an option for Group Sync roles.
This can cause odd access issues, such as in https://gitlab.zendesk.com/agent/tickets/219713 , where it looks like what's happening is that when a user signs in, they're removed from the top-level because they're not in a SAML Group, but readded through the SAML Default Role. The problem is that the user gets a 404 when they first sign in due to the initial removal.
**Note**: The behavior in which the user is readded to the Group via the SAML Default Role is not consistent on all the cases.
### Proposal
Add Minimal Access role to the top-level SAML Group Sync list of possible roles.
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### User experience goal
User should be able to configure Minimal Access role for users at top-level when using Group Sync
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Include use cases, benefits, goals, or any other details that will help us understand the problem better.
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### Availability & Testing
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### What does success look like, and how can we measure that?
Have "Minimal Access" role in top-level SAML Group Sync dropdown.
### Availability & Testing
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* Unit test changes
* Integration test changes
* End-to-end test change
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**What risks does this change pose to our availability?**
This is a low risk feature for GitLab.com and self-managed availability.
**What additional test coverage or changes to tests will be needed?**
* When minimal access is selected as an access level, all users not part of a Group in the IDP are added to the group with minimal access and that they are able to sign-in correctly.
* When a minimal access group link is not available/set, users not part of a Group in the IDP are removed from the top level group. In this case ensure, that they do not see a 404 when they try to sign-in.
**Will it require cross-browser testing?**
N/A
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