v8.0.0-rc.11-dev.14: Make Postgres targets own inbound list decoding (#30235)

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Linked issue Closes #30164 . No Linear ticket/project for this branch by request; this PR intentionally does not close or prefix a Linear issue. Summary Postgres list decoding now follows the contract-declared list shape instead of the driver's static parser table, so enum arrays and builtin arrays enter one target-owned decode path. The PR also records the approved fixed-scale numeric-list string migration and the…

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