perf(l1,l2): dedup execution witness codes and trie nodes #5725
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This change deduplicates contract bytecodes when building the execution witness by tracking seen code hashes and only pushing each bytecode once. It also removes redundant intermediate Vec allocations when extending the list of trie nodes, extending directly from map values instead. Both adjustments preserve the semantics of the witness while reducing unnecessary allocations, storage lookups, and payload size.