validator: add LWT test coverage for Alternator#468
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Add ConditionExpression parameter to `update_item_expr` helper and exercise the LWT/Paxos code path under `only_rmw_uses_lwt` write isolation for PutItem, DeleteItem, and UpdateItem SET.
Test SET #vec[i], REMOVE #vec[i], list_append, and ADD #vec[i] on the vector column — all element-level operations are RMW and exercise the LWT/Paxos path. Verifies reindexing, de-indexing, rejection of invalid mutations (wrong type, wrong dimension), and correcting items with mixed-type or wrong-dimension vectors so they become indexable.
New test suite exercising VS indexing when every write is routed through the LWT/Paxos path via `--alternator-write-isolation=always_use_lwt`. Covers PutItem, DeleteItem, UpdateItem, and BatchWriteItem (put-only, mixed put+delete, delete-only).
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Add test coverage for Vector Store indexing through the LWT/Paxos code
path on Alternator writes — conditional expressions, element-level
UpdateItem operations, and a dedicated
always_use_lwttest suite.