Clean up deprecated loop properties and parameters

[crusaderky]

Clean up loop properties and parameters which have been deprecated for the last 2 years.

[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   11h 13m 11s ⏱️ -52s
 4 119 tests  -  5   4 013 ✅  -  2    104 💤 ±0  2 ❌  - 3 
59 723 runs   - 75  57 246 ✅  - 73  2 474 💤 ±0  3 ❌  - 2 

For more details on these failures, see this check.

Results for commit 0544e53. ± Comparison against base commit f431280.

This pull request removes 5 tests.

distributed.deploy.tests.test_cluster ‑ test_deprecated_loop_properties
distributed.diagnostics.tests.test_progressbar ‑ test_deprecated_loop_properties
distributed.tests.test_client ‑ test_deprecated_loop_properties
distributed.tests.test_scheduler ‑ test_io_loop
distributed.tests.test_worker ‑ test_io_loop_alternate_loop