Acceptance tests for vertex:edge tool

[archena]

Is your feature request related to a problem? Please describe.
Since there's not much logic, testing needs to be done with integration tests (there isn't much opportunity for unit testing), mocking GCP services and k8s. Especially to check how the failure cases are handled.

Describe the solution you'd like
Given a config for the edge call, we verify the calls that it makes to APIs such as k8s, Vertex.
Given an erroneous config, we verify that the tool handles it appropriately.

• Mock and test vertex endpoint create, get, deploy methods
• Mock and test lock/unlock of the state in Google Storage
• Mock and test create/get bucket from Google Storage
• Testing methods that make shell calls? (DVC, k8s) - this would be redundant following Change shell invocations to kubernetes/helm library calls for Sacred deployment #2