Test Geo Node API

What does this MR do?

Adds QA scenarios for the Geo Node API. You can also now run tests against specific spec file. For example

bin/qa QA::EE::Scenario::Test::Geo --without-setup --primary-address http://localhost:5100 --secondary-address http://localhost:5200 --primary-name primary --secondary-name secondary qa/specs/features/ee/api/geo_nodes_spec.rb

Are there points in the code the reviewer needs to double check?

Why was this MR needed?

To start testing the Geo Node API in a QA setting

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• [-] Documentation created/updated
• API support added
• Tests added for this feature/bug
• Review
  • [-] Has been reviewed by UX
  • [-] Has been reviewed by Frontend
  • Has been reviewed by Backend
  • [-] Has been reviewed by Database
• Conform by the merge request performance guides
• Conform by the style guides
• Squashed related commits together
• Internationalization required/considered
• [-] If paid feature, have we considered GitLab.com plan and how it works for groups and is there a design for promoting it to users who aren't on the correct plan

What are the relevant issue numbers?

Closes gitlab-qa#131 (closed)