Currently `task::task_npx_non_existent` is consistently failing in CI
([example](https://github.com/denoland/deno/actions/runs/9192958846/job/25282900321#step:43:2772))
due to the output changing slightly
```
-- OUTPUT START --
Task non-existent npx this-command-should-not-exist-for-you
npm ERR! code E404
npm ERR! 404 Not Found - GET http://localhost:4260/this-command-should-not-exist-for-you
npm ERR! 404
npm ERR! 404 'this-command-should-not-exist-for-you@*' is not in this registry.
npm ERR! 404
npm ERR! 404 Note that you can also install from a
npm ERR! 404 tarball, folder, http url, or git url.
npm ERR! A complete log of this run can be found in: /Users/runner/.npm/_logs/2024-05-22T17_58_42_473Z-debug-0.log
-- OUTPUT END --
-- EXPECTED START --
Task non-existent npx this-command-should-not-exist-for-you
npm error code E404
npm error 404 Not Found - GET http://localhost:4260/this-command-should-not-exist-for-you
[WILDCARD]
-- EXPECTED END --
```
I'm not sure what changed in CI to cause this (and I can't repro it
locally, even matching the version of npm and node on the github
runners), but fix it with more lenient expected output for that test.
This looks like a massive PR, but it's only a move from cli/tests ->
tests, and updates of relative paths for files.
This is the first step towards aggregate all of the integration test
files under tests/, which will lead to a set of integration tests that
can run without the CLI binary being built.
While we could leave these tests under `cli`, it would require us to
keep a more complex directory structure for the various test runners. In
addition, we have a lot of complexity to ignore various test files in
the `cli` project itself (cargo publish exclusion rules, autotests =
false, etc).
And finally, the `tests/` folder will eventually house the `test_ffi`,
`test_napi` and other testing code, reducing the size of the root repo
directory.
For easier review, the extremely large and noisy "move" is in the first
commit (with no changes -- just a move), while the remainder of the
changes to actual files is in the second commit.
