Improve tracking for agent edits (#27857)

Release Notes:

- N/A

---------

Co-authored-by: Nathan Sobo <nathan@zed.dev>
Co-authored-by: Max Brunsfeld <maxbrunsfeld@gmail.com>

crates/assistant_tools/Cargo.toml

@@ -14,7 +14,6 @@ path = "src/assistant_tools.rs"
 [dependencies]
 anyhow.workspace = true
 assistant_tool.workspace = true
-clock.workspace = true
 chrono.workspace = true
 collections.workspace = true
 feature_flags.workspace = true
@@ -42,7 +41,6 @@ worktree.workspace = true
 open = { workspace = true }
 
 [dev-dependencies]
-clock = { workspace = true, features = ["test-support"] }
 collections = { workspace = true, features = ["test-support"] }
 gpui = { workspace = true, features = ["test-support"] }
 language = { workspace = true, features = ["test-support"] }