Remove avoid_ci mark

[crusaderky]

This mark just confuses infrequent contributors, who will be left wasting time trying to figure out why a test fails on their box (the answer it's that's been broken for a while and nobody noticed).

[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 44m 4s ⏱️ + 39m 14s
 4 079 tests +    3   3 967 ✅ ±    0    108 💤 + 2  2 ❌  - 1  2 🔥 +2 
59 201 runs  +1 473  56 702 ✅ +1 375  2 492 💤 +94  2 ❌  - 1  5 🔥 +5 

For more details on these failures and errors, see this check.

Results for commit be2a42f. ± Comparison against base commit d8fabe2.

This pull request removes 2 and adds 5 tests. Note that renamed tests count towards both.

distributed.cli.tests.test_dask_worker.test_listen_address_ipv6[tcp:..[ ‑ 1]:---nanny]
distributed.cli.tests.test_dask_worker.test_listen_address_ipv6[tcp:..[ ‑ 1]:---no-nanny]

distributed.deploy.tests.test_old_ssh ‑ test_cluster
distributed.deploy.tests.test_ssh ‑ test_defer_to_old
distributed.deploy.tests.test_ssh ‑ test_old_ssh_with_local_dir
distributed.tests.test_client ‑ test_benchmark_hardware
distributed.tests.test_stress ‑ test_stress_communication

This pull request removes 2 skipped tests and adds 4 skipped tests. Note that renamed tests count towards both.

distributed.cli.tests.test_dask_worker.test_listen_address_ipv6[tcp:..[ ‑ 1]:---nanny]
distributed.cli.tests.test_dask_worker.test_listen_address_ipv6[tcp:..[ ‑ 1]:---no-nanny]

distributed.deploy.tests.test_old_ssh ‑ test_cluster
distributed.deploy.tests.test_ssh ‑ test_old_ssh_with_local_dir
distributed.tests.test_client ‑ test_benchmark_hardware
distributed.tests.test_stress ‑ test_stress_communication