Authentication replace

[parssinen]

Summary

Modifies node server to not redirect to Helsinki authentication server but instead use basic auth.

Dependencies

Testing instructions

Checklist for pull request creator

• A task has been created for the PR on the Kanban board with necessary details filled (one task / repo)
• The commits and commit messages adhere to version control conventions
• The code is consistent with the existing code base
• Tests have been written for the change
• All tests pass (unit, e2e)
• All code has been linted and there aren't any lint errors
• The change has been tested in the browser with Firefox 59+, Chrome 66+
• The change has been tested with a smaller screen (tablet)
• The change conforms to the UX specifications
• All translations have been added (fi, sv, en)
• The code is self-documenting or has been documented sufficiently, e.g., in the README
• The branch has been rebased against master before the PR was created

Checklist for pull request reviewer (copy to review text box)

- [ ] A task has been created for the PR on the Kanban board with necessary details filled (one task / repo)
- [ ] The commits and commit messages adhere to [version control conventions](https://voltti.atlassian.net/wiki/spaces/NUORA/pages/32999/Versionhallintak+yt+nn+t#Versionhallintak%C3%A4yt%C3%A4nn%C3%B6t-Commit-viestienmuotoilu)
- [ ] The code is consistent with the existing code base
- [ ] All changes in all changed files have been reviewed
- [ ] Tests have been written for the change
- [ ] All tests pass (unit, e2e)
- [ ] All code has been linted and there aren't any lint errors
- [ ] The change has been tested in the browser with Firefox 59+, Chrome 66+
- [ ] The change has been tested with a smaller screen (tablet)
- [ ] The change conforms to the [UX specifications](https://voltti.atlassian.net/wiki/spaces/NUORA/pages/74809369/UX)
- [ ] All translations have been added (fi, sv, en)
- [ ] The code is self-documenting or has been documented sufficiently, e.g., in the README
- [ ] The PR branch has been rebased against master and force pushed if necessary before merging

[kuosmark]

• A task has been created for the PR on the Kanban board with necessary details filled (one task / repo)
• The commits and commit messages adhere to version control conventions
• The code is consistent with the existing code base
• All changes in all changed files have been reviewed
• Tests have been written for the change
• All tests pass (unit, e2e)
• All code has been linted and there aren't any lint errors
• The change has been tested in the browser with Firefox 59+, Chrome 66+
• The change has been tested with a smaller screen (tablet)
• The change conforms to the UX specifications
• All translations have been added (fi, sv, en)
• The code is self-documenting or has been documented sufficiently, e.g., in the README
• The PR branch has been rebased against master and force pushed if necessary before merging