[Core] Deflake gcs_placement_group_manager_test (ray-project#41710)

Another attempt after ray-project#30787. The root cause is that gcs_placement_group_manager is supposed to be single threaded but our test creates two threads (main thread and the io thread) and causes race conditions. The fix is removing one thread and run the io context in the main thread. Signed-off-by: Jiajun Yao <jeromeyjj@gmail.com>
ShuN6211 · Dec 8, 2023 · 959a48b · 959a48b
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diff --git a/ci/ray_ci/core.tests.yml b/ci/ray_ci/core.tests.yml
@@ -1,3 +1,2 @@
 flaky_tests:
-  - //:gcs_placement_group_manager_test
   - //python/ray/tests:test_autoscaler