Add `buildFinalResult` to `CodeBlockItemListBuilder` to ensure newline between expressions#2829

ahoppen merged 2 commits intoswiftlang:mainswiftlang/swift-syntax:mainfrom

mateusrodriguesxyz:code-block-builder-add-build-final-resultmateusrodriguesxyz/swift-syntax:code-block-builder-add-build-final-resultCopy head branch name to clipboard