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6297843317
Fix several test flakes: - test_sharding_service_smoke had log failures on "Dropped LSN updates" - test_emergency_mode had log failures on a deletion queue shutdown check, where the check was incorrect because it was expecting channel receiver to stay alive after cancellation token was fired. - test_secondary_mode_eviction had racing heatmap uploads because the test was using a live migration hook to set up locations, where that migration was itself uploading heatmaps and generally making the situation more complex than it needed to be. These are the failure modes that I saw when spot checking the last few failures of each test. This will mostly/completely address #6511, but I'll leave that ticket open for a couple days and then check if either of the tests named in that ticket are flaky. Related #6511