As a practitioner I want to the option to an expression builder within the UI to:

• search for and select from a set of hierarchical Data Objects
• set conditions
• name variables
  so that I can add these selections as Given/Expect input values when creating a scenario test outline.

Verification conditions:

• CSS styles that employ relevant PatternFly styles.
• CSS that articulates the design wireframe attached, and:
  https://redhat.invisionapp.com/share/BVKORFBUJ24#/screens/302476075, and:
  https://docs.google.com/document/d/1I_ghU9An--uQRzuVV9zXB387HLYjZcc01LXFXAK_LIk/edit
• Reviewed by scrum team prior to PR/dev delivery.