[Test failure] Test issues with empty shard migrations

[madolson]

We've seen a number of failures related to empty shard migration, https://github.com/valkey-io/valkey/actions/runs/10171585430/job/28132822421.

*** [err]: Empty-shard migration target is auto-updated after failover in target shard in tests/unit/cluster/slot-migration.tcl
incorrect slot state on R 0: expected [609->-65022b36a8a80a575ab2d01a7cf024a8aa963d47]; got [609->-1721381f63cd18d971639e00c0f5ae9c8accb68c]
*** [err]: Empty-shard migration source is auto-updated after failover in source shard in tests/unit/cluster/slot-migration.tcl
incorrect slot state on R 0: expected [609->-65022b36a8a80a575ab2d01a7cf024a8aa963d47]; got [609->-1721381f63cd18d971639e00c0f5ae9c8accb68c]

These appear to be race conditions. We've temporarily commented out the tests until the issue has been resolved.