chore: merge git crates (#5909)

Merge `git-apply` and `git-tooling` into `utils/`

codex-rs/protocol/src/models.rs

@@ -11,7 +11,7 @@ use serde::ser::Serializer;
 use ts_rs::TS;
 
 use crate::user_input::UserInput;
-use codex_git_tooling::GhostCommit;
+use codex_git::GhostCommit;
 use codex_utils_image::error::ImageProcessingError;
 use schemars::JsonSchema;