assistant edit tool: Revert fuzzy matching (#26996)

#26935 is leading to bad edits, so let's revert it for now. I'll bring
back a version of this, but it'll likely just focus on indentation
instead of making the whole search fuzzy.

Release Notes: 

- N/A
5615be51ccAgus Zubiaga committed on 3/18/2025, 4:08:09 PM· committed by GitHubparent06e9f0e
4 files changedLine totals unavailable