Table locks - always grab table locks through the transaction interface #14379
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…ce to prevent duplicate shared locks
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This is a follow-up PR from #13712 that removes the code-paths that grabbed the table lock through a different manner, avoiding the transaction-level interface. Looking at the code this seems to only be used in the WAL - so it's unlikely this would actually cause problems, but it's better to clean up this code path entirely so it doesn't get accidentally used in the future.