snippets: Preserve leading whitespace (#31933)

Closes #18481

Release Notes:

- Snippet insertions now preserve leading whitespace instead of using
language-specific auto-indentation.
56d4c0af9fMichael Sloan committed on 6/3/2025, 2:37:06 AM· committed by GitHubparentfeeda7f
3 files changedLine totals unavailable