codegen error handling bugs

I'm reviewing codegen and seeing some bugs in cleanup on errors, in particular scope enter/exit bugs.
Will use this issue to track them.

Linked PRs

• gh-156467
• gh-156473
• gh-156497
• gh-156498
• gh-156499
• gh-156502
• gh-156507
• gh-156508
• gh-156509
• gh-156511
• gh-156520
• gh-156522
• gh-156535
• gh-156536
• gh-156547
• gh-156571
• gh-156572
• gh-156578
• gh-156579
• gh-156582
• gh-156615
• gh-156616
• gh-156617
• gh-157338

先檢閱已連結的 PR，尤其是 gh-156467 到 gh-157338，以了解還有哪些程式碼產生清理工作和 scope 進入/離開錯誤尚未解決。這個 issue 是一個追蹤用的總括 issue，未指定檔案、測試或完成條件，因此無法僅根據該 issue 判定是否已完成。