BED-4666: remove logout on 401 /features

[benwaples]

Description

Block logout attempts after a 401 when the requested url is /api/v2/features

Motivation and Context

This PR addresses: BED-4666

When a user is logging in with MFA, if the page is unfocused and then refocused, the /features endpoint will 401 and force the user back to the username/password screen.

How Has This Been Tested?

manual tests and added unit tests

Screenshots (optional):

Types of changes

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• I have met the contributing prerequisites
  • Assigned myself to this PR
  • Added the appropriate labels
  • Associated an issue: Issues and Pull Requests README #672
  • Read the Contributing guide: https://github.com/SpecterOps/BloodHound/wiki/Contributing
• I have ensured that related documentation is up-to-date
  • Open API docs
  • Code comments (GoDocs / JSDocs)
• I have followed proper test practices
  • Added/updated tests to cover my changes
  • All new and existing tests passed