feat: Update result_set.proto to return undeclared parameters in ExecuteSql API (#2101)

* feat: Update result_set.proto to return undeclared parameters in ExecuteSql API PiperOrigin-RevId: 480025979 Source-Link: googleapis/googleapis@cb6fbe8 Source-Link: https://github.com/googleapis/googleapis-gen/commit/bf166b89d2a6aa3510374387af0f45e4828dea03 Copy-Tag: eyJwIjoiLmdpdGh1Yi8uT3dsQm90LnlhbWwiLCJoIjoiYmYxNjZiODlkMmE2YWEzNTEwMzc0Mzg3YWYwZjQ1ZTQ4MjhkZWEwMyJ9 * 🦉 Updates from OwlBot post-processor See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

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