Only allow access to login page when users are not signed in when public projects and groups are not allowed

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Description

Do not allow access to anything other than the login page by unauthenticated users.

Proposal

When publicly visible projects and groups are not allowed, only allow access to the login page to users who are not signed in.

Links / references

Customer ticket -> https://gitlab.zendesk.com/agent/tickets/94063 (internal)