[CI] Spurious test failures

[mfbalin]

🔨Work Item

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Project tracker: https://github.com/orgs/dmlc/projects/2

Description

Example failures: https://github.com/dmlc/dgl/pull/7470#issuecomment-2190675466, https://github.com/dmlc/dgl/pull/7470#issuecomment-2190727402, https://github.com/dmlc/dgl/pull/7475#issuecomment-2192441404, https://github.com/dmlc/dgl/pull/7485#issuecomment-2192788339

If some of the tests are known to fail randomly, they should be disabled until the issues are resolved.

[mfbalin]

I am assigning you to this issue @Rhett-Ying, feel free to unassign or assign someone else.

[Rhett-Ying]

All distributed tests are temporarily skipped in https://github.com/dmlc/dgl/pull/7490

[mfbalin]

The tests don't seem to fail anymore. Does this mean the problems are solved, or are some tests skipped?