Split up the big main test into many smaller ones

[adamchalmers]

PR currently has a problem with logging in.

Many of the tests require a logged-in Zoo CLI. That's fine in the current model, where all tests run in one process sequentially. But with nextest, each test runs in its own process. So each test has to log in, then run its test. That was fine but somehow, each test would successfully run its login code, and then try to run the relevant test (e.g. zoo kcl mass). But that relevant test would fail, saying you weren't logged in. Seems like the test wasn't passing the logged-in status into the next CLI invocation. Idk what to do about it.

[graphite-app]

There's a syntax error in the format string. The parentheses are incorrectly ordered - it currently reads zoo {} )({})\n{} but should be zoo {} ({})\n{}. This will cause a runtime error when formatting the version string.

Suggested change

	"zoo {} )({})\n{}",
	"zoo {} ({})\n{}",

Spotted by Diamond

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