Route minimal access user to groups dashboard

What does this MR do and why?

A common scenario is the following:

• A top level group has group SAML SSO enabled
• The top level group has a default access level of minimal access
• A user has a membership with a child group of the top level group

In such a scenario, when a user performs a group SAML login they receive a 404 error as they're directed to the top level group path.

This MR will redirect the login to the users group dashboard page instead.

References

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MR acceptance checklist

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Related to #267996, #341768 (closed), #351378 (closed)