refactor: adds a E2ETestRunner for E2E tests

[jpower432]

Description

Update E2E test code to use a single class and fixture instead of a collection of functions.
Also removes negative test cases (which test specific failures and logging statements) that don't need to be tested in the container to the unit tests from the e2e tests.

Fixes #166

Type of change

• Refactor

How has this been tested?

• Updated unit tests run locally
• E2E tests run locally

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[beatrizmcouto]

LGTM. @jpower432 just wanted to understand the reasoning behind changing to a use a single class and fixture instead of a collection of functions. Both work but single class makes the code cleaner, is that is or another reasoning behind it? Thank you

[jpower432]

@beatrizmcouto Great question! A few reasons behind this change from my perspective:

• It adds encapsulation for how the commands are built and invoked. Before just the building of the command was encapsulated and they were invoked in each E2E test. Encapsulating them both and organizing them into a class makes it more consistent and easier to change later because there is only one place to change instead of 3+ places.
• Classes support inheritance. So I can create another more generic TestRunner classes for CLI invocation. This class can inherit overlapping logic from that.
• Some of the E2E test logic was spread out over multiple files and the class groups the related logic together. So similar to point 1. Easier to find/change and manage as the test suite grows.

[jpower432]

@JimFuller-RedHat PTAL. Relates to a comment you had on #158.