Welcome to the grand splitting of CLI integration tests:
- replaced `test-cli` test suite with `test-e2e`
- made some small fixes along the way
- split integration tests into 3 files
- moved shared logic to `packages/cli/test/helpers/*`
- simplified `_execa` / `execa` / `execute` usage into `execCli` and `exec`
- simplified arguments required to make these work
- defaulted `execCLI` to set `NO_COLOR=1` to make assertions simpler in tests that aren't testing color/emoji support
- expanded functionality of `formatOutput` to handle error states
- centralized temp dir handling and cleanup
- enhanced `waitForPrompt` to:
- more clearly show what it was waiting for
- support waiting for regex, string, or a function that returns a boolean
- show what was the most recent thing it saw
- end early if the process it's monitoring exits
- removed some test pollution where unnecessary, shifted some into `beforeAll`
- renamed unit tests helper from `setupFixture` to `setupUnitFixture` to avoid confusion with the new shared helper `setupE2EFixture`
Some of this could be pulled out into a separate PR, but the feedback cycle is a slog, which this PR is helping to address. I'd be happy to discuss what could be pulled out, but I'd also be happy to get the whole thing through.
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Wait for prompt failures:
<img width="939" alt="CleanShot 2023-03-27 at 10 24 21@2x" src="https://user-images.githubusercontent.com/41545/227987773-a3582549-32f9-4131-8a35-7be7cc265b66.png">
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Current Timing:
```
Tests / test-e2e (vercel, 1, ubuntu-latest) (pull_request) Successful in 3m
Tests / test-e2e (vercel, 2, ubuntu-latest) (pull_request) Successful in 8m
Tests / test-e2e (vercel, 3, ubuntu-latest) (pull_request) Successful in 8m
```
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Before merge, I'll mark the original `CLI` integration test suite as no longer required.
