Add Client.unregister_scheduler_plugin method

[ghost]

Closes #7958

• Tests added / passed
• Passes pre-commit run --all-files

[GPUtester]

Can one of the admins verify this patch?

Admins can comment ok to test to allow this one PR to run or add to allowlist to allow all future PRs from the same author to run.

[github-actions]

Unit Test Results

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

       20 files  ±       0         20 suites  ±0   10h 50m 6s ⏱️ - 1m 22s
  3 718 tests +     14    3 609 ✔️ +     17     106 💤 ±  0  3 ❌  - 3 
35 962 runs  +1 155  34 209 ✔️ +1 104  1 748 💤 +52  5 ❌  - 1 

For more details on these failures, see this check.

Results for commit 8ece1b7. ± Comparison against base commit a47cb0a.

This pull request removes 7 and adds 21 tests. Note that renamed tests count towards both.

distributed.shuffle.tests.test_shuffle_extension
distributed.shuffle.tests.test_shuffle_extension ‑ test_installation_on_scheduler
distributed.shuffle.tests.test_shuffle_extension ‑ test_installation_on_worker
distributed.shuffle.tests.test_shuffle_extension ‑ test_split_by_partition
distributed.shuffle.tests.test_shuffle_extension ‑ test_split_by_worker
distributed.shuffle.tests.test_shuffle_extension ‑ test_split_by_worker_empty
distributed.shuffle.tests.test_shuffle_extension ‑ test_split_by_worker_many_workers

distributed.diagnostics.tests.test_progress ‑ test_multiprogress_cancel
distributed.diagnostics.tests.test_progress ‑ test_multiprogress_warns
distributed.diagnostics.tests.test_progress ‑ test_multiprogress_with_prefix
distributed.diagnostics.tests.test_progress ‑ test_multiprogress_with_spans
distributed.diagnostics.tests.test_progressbar ‑ test_progress_function_raises
distributed.diagnostics.tests.test_progressbar ‑ test_progress_function_warns
distributed.diagnostics.tests.test_scheduler_plugin ‑ test_unregister_scheduler_plugin
distributed.diagnostics.tests.test_scheduler_plugin ‑ test_unregister_scheduler_plugin_from_client
distributed.diagnostics.tests.test_widgets ‑ test_multibar_func_warns
distributed.diagnostics.tests.test_widgets ‑ test_multibar_with_spans
…

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

distributed.shuffle.tests.test_shuffle_extension

distributed.shuffle.tests.test_shuffle_plugins

♻️ This comment has been updated with latest results.

[hendrikmakait]

@bphillips-exos, thanks for creating this pull request! The code generally looks good to me, I have a few suggestions regarding the tests.

[ghost]

Thanks @hendrikmakait for the suggestions! I've moved the tests into the suggested file

[hendrikmakait]

Thanks, @bphillips-exos, and congratulations on your first contribution!