crud: support router-first upgrades from pre-1.6 storages#499
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Add router-side compatibility for mixed CRUD versions where routers use _crud.call_on_storage but storages do not have it yet. Routers now detect unsupported _crud.call_on_storage errors, cache legacy replicaset state, and retry via direct storage calls.
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Add router-side compatibility for mixed CRUD versions where routers use _crud.call_on_storage but storages do not have it yet. Routers now detect unsupported _crud.call_on_storage errors, cache legacy replicaset state, and retry via direct storage calls.
Closes TNTP-7891