Replace OldIndexBackwardsCompatibilityIT#testOldClusterStates with a full cluster restart qa test #25370
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OldIndexBackwardsCompatibilityIT#testOldClusterStates tested whether global and index metadata could be read from data directory. I think this can also be tested in full cluster qa test that checks cluster state via cluster state api, this would also verify that the upgraded nodes were able to read the global and index state files successfully.
Relates to #24939