uvloop tests

[crusaderky]

The only test for uvloop is not triggered by CI, was broken, and was not covering the major use case of CLI wrappers.

Closes #9218

This PR still does not trigger the tests in CI due to uvloop not being available on Windows, which does not play well with distributed's legacy CI. #9276 starts running it.

[github-actions]

Unit Test Results

See test report for an extended history of previous test failures. This is useful for diagnosing flaky tests.

    31 files  ± 0      31 suites  ±0   10h 52m 6s ⏱️ + 11m 34s
 4 080 tests + 4   3 964 ✅  - 1    112 💤 + 4  4 ❌ +1 
59 218 runs  +61  56 611 ✅  - 1  2 603 💤 +61  4 ❌ +1 

For more details on these failures, see this check.

Results for commit fb50daa. ± Comparison against base commit c12638f.

This pull request removes 1 and adds 5 tests. Note that renamed tests count towards both.

distributed.tests.test_config ‑ test_uvloop_event_loop

distributed.cli.tests.test_dask_scheduler ‑ test_uvloop
distributed.cli.tests.test_dask_spec ‑ test_uvloop
distributed.cli.tests.test_dask_worker ‑ test_uvloop[--nanny]
distributed.cli.tests.test_dask_worker ‑ test_uvloop[--no-nanny]
distributed.tests.test_config ‑ test_uvloop

This pull request removes 1 skipped test and adds 5 skipped tests. Note that renamed tests count towards both.

distributed.tests.test_config ‑ test_uvloop_event_loop

distributed.cli.tests.test_dask_scheduler ‑ test_uvloop
distributed.cli.tests.test_dask_spec ‑ test_uvloop
distributed.cli.tests.test_dask_worker ‑ test_uvloop[--nanny]
distributed.cli.tests.test_dask_worker ‑ test_uvloop[--no-nanny]
distributed.tests.test_config ‑ test_uvloop