fix(server): truncate embedding tables #7449
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Description
Re-running smart search or face detection destroys the HNSW index because of the number of dead tuples it creates. Truncating is appropriate here since it also purges dead tuples and indexes. We avoided truncation before because it didn't work on pgvecto.rs 0.1.11, but we can safely do it on 0.2.0 now.
Fixes #7313
How Has This Been Tested?
Tested with running "all" jobs on smart search and face detection, as well as by changing the smart search model.