test: Add CLI tests for all subcommands & most of their flags

[rschristian]

What kind of change does this PR introduce?

tests

Did you add tests for your changes?

Yes

Summary

Originally part of #1699 but extracted out to simplify the diff.

Just adds a whole bunch of tests and fixes some blind spots. Adds new test suites for info and list commands as well as adds tests for nearly every CLI flag. I did skip some due to being slow (like --install for create) or already being covered well enough (--cwd for both build & create basically runs our test suite).

Does this PR introduce a breaking change?

No

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Latest commit: 3d030a4

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