CI test darwin://python/ray/tests:test_multi_node is consistently_failing

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CI test darwin://python/ray/tests:test_multi_node is consistently_failing. Recent failures:
- https://buildkite.com/ray-project/postmerge-macos/builds/7162#01987fcf-d2dd-40d7-ab47-675bc7df8452
- https://buildkite.com/ray-project/postmerge-macos/builds/7162#01987f0b-3872-4031-a057-406c38641c46

DataCaseName-darwin://python/ray/tests:test_multi_node-END
Managed by OSS Test Policy

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Blamed commit: 792a2eb found by bisect job https://buildkite.com/ray-project/release-tests-bisect/builds/2710

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This test is now considered as flaky because it has been failing on postmerge for too long. Flaky tests do not run on premerge.

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Test passed on latest run: https://buildkite.com/ray-project/postmerge-macos/builds/7214#01988700-2d96-4b14-b5b4-a9a2ffb2c8bc