Add to CLI unit tests

[minghinmatthewlam]

Context and scope
There are some basic unit tests in PR, but we can also add unit tests with basic inputs. There are unit tests on branch cli-unit-tests, which run successfully individually, but ran altogether in go test ./... they fail. This is likely due to some shared state, and the commands not reinitializing between the test cases.

Discussion and alternatives
In the unit tests might need to make copies of the commands to initialize between test cases.

[michaelkaplan13]

Closing this since the Teleporter CLI is going to be removed in favor of commands within the Avalanche CLI as a part of #377