feat(mysql): translate UPDATE … FROM … syntax to UPDATE … JOIN … when generating MySQL #6655
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Extend the MySQL generator so that UPDATE … FROM … statements (not supported by MySQL) are emitted as UPDATE … JOIN …, synthesizing ON TRUE predicates when no join condition is specified, and handling nested/comma joins.
Add test_update_from_to_join to cover the new rendering and adjust a Teradata cross-dialect test expectation to match the JOIN-based MySQL output.