[ML] Migration test should use different assertions depending on the old cluster version #37077
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MlMigrationFullClusterRestartIT is a full cluster restart test. If the old cluster is v6.6.0 or later then the configurations are already in index documents and don't need to be migrated. This change removes the wait for migration check for those clusters.
The test started failing after the v6.6 branch was cut
Closes #36816