Expand tests to cover ssh logic

[msheiny]

Partial progress towards integration tests : #302

What's Changed

• Added the fakenos library to spin up an SSH mock IOS device as part of unit-tests. This increases the amount of code with the ultimate goal of preventing regressions and allow further refactoring with more confidence.
• Added one log line to aid in debugging jinja errors against the job. I'll circle back and add a larger debug issue there cause I burnt a lot of time figuring out the problem.

Remaining work

• There is currently a bug in the CSV handling that prevents me from also adding a CSV test here. Waiting for Address bug with CSV import on sync job #314 to get merged so that I can circle back and add a relevant test for that as well.
• There are two issues with fakenos atm:

1. They aren't publishing the latest code to pypi and the one that is published has its own sets of bugs that i ran into, so i had to install directly from git in the project.toml. I mentioned it to the maintainers in an issue, not sure if they'll address
2. There is a bug with plugin ecosystem logic that allows you to define custom device responses. I had to patch around it in our tests which is not a great long-term solution. So I want to make a PR for that upstream OR worst case fork that library and install from there.

I'm not sure if it's worth adding documentation updates in this PR to discuss the fakenos library but happy to add those pages if ya'll deem its necessary here.

To Do

• Explanation of Change(s)
• Added change log fragment(s) (for more information see the documentation)
• Attached Screenshots, Payload Example
• Unit, Integration Tests
• Documentation Updates (when adding/changing features)
• Outline Remaining Work, Constraints from Design