remove dependence on apivore

[erluti]

Problem Statement

How do we remove our dependency on apivore? It is no longer maintained and doesn't support Rails 6.

Objectives

• Use only gems that support upgrading our system

---

Tasks

• Review/Maintain test coverage provided from using apivore

Acceptance Criteria

• no longer dependent on apivore

[erluti]

Apivore is only used by spec/request/swagger_spec.rb. This spec makes requests to endpoints and compares responses to the swagger documentation. We can remove apivore with no issues if there's a way to set up an equivalent test.

[erluti]

I looked into using the committee gem because it has an assert_schema_conform test helper. It was failing to load the driver from our specs because of how we use #ref in the parameters.
WIP branch: https://github.com/department-of-veterans-affairs/vets-api/tree/be-tools/pb/use-committee-to-test-api-specs

Issue I created related to the driver failing to load our schema interagent/committee#259 for the committee gem.

[holdenhinkle]

It would be great if this could be completed in the next couple of sprints.