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

crates/assistant_tools/Cargo.toml

@@ -39,7 +39,5 @@ rand.workspace = true
 collections = { workspace = true, features = ["test-support"] }
 gpui = { workspace = true, features = ["test-support"] }
 language = { workspace = true, features = ["test-support"] }
-pretty_assertions.workspace = true
 project = { workspace = true, features = ["test-support"] }
-unindent.workspace = true
 workspace = { workspace = true, features = ["test-support"] }