HSL login Oauth and MFA

[matleppa]

Closes #3593 (as a side effect)

Changes

• New OAuth login button (HSL)
• login is accepted via HSL OAuth

Developer checklist

This checklist is to be completed by the PR developer:

• Alternative solutions were compared/discussed before writing code
  • trade-offs with this solution are considered acceptable
• Code in this PR adheres to the project styleguide
• This pull request does not decrease project test coverage
• If the code changes existing database collection(s), migration has been written
• If UI texts are added or changed, all texts are internationalized

Reviewer checklist

Reviewed by: @username1

This list is to be completed by the pull request reviewer:

• Code works as described/expected
• Code seems to be error free
  • no browser console errors visible
  • no server console errors visible
  • passes CI build
• Code is written in a way that promotes maintainability
  • easy to understand
  • well organized
  • follows project coding standards and conventions
  • well documented

[ilarimikkonen]

yes!