Represent git statuses more faithfully (#23082)

First, parse the output of `git status --porcelain=v1` into a
representation that can handle the full "grammar" and doesn't lose
information.

Second, as part of pushing this throughout the codebase, expand the use
of the existing `GitSummary` type to all the places where status
propagation is in play (i.e., anywhere we're dealing with a mix of files
and directories), and get rid of the previous `GitSummary ->
GitFileStatus` conversion.

- [x] Synchronize new representation over collab
  - [x] Update zed.proto
  - [x] Update DB models
- [x] Update `GitSummary` and summarization for the new `FileStatus`
- [x] Fix all tests
  - [x] worktree
  - [x] collab
- [x] Clean up `FILE_*` constants
- [x] New collab tests to exercise syncing of complex statuses
- [x] Run it locally and make sure it looks good

Release Notes:

- N/A

---------

Co-authored-by: Mikayla <mikayla@zed.dev>
Co-authored-by: Conrad <conrad@zed.dev>

crates/project/src/project.rs

@@ -39,10 +39,7 @@ use futures::{
 pub use image_store::{ImageItem, ImageStore};
 use image_store::{ImageItemEvent, ImageStoreEvent};
 
-use git::{
-    blame::Blame,
-    repository::{GitFileStatus, GitRepository},
-};
+use git::{blame::Blame, repository::GitRepository, status::FileStatus};
 use gpui::{
     AnyModel, AppContext, AsyncAppContext, BorrowAppContext, Context as _, EventEmitter, Hsla,
     Model, ModelContext, SharedString, Task, WeakModel, WindowContext,
@@ -1449,7 +1446,7 @@ impl Project {
         &self,
         project_path: &ProjectPath,
         cx: &AppContext,
-    ) -> Option<GitFileStatus> {
+    ) -> Option<FileStatus> {
         self.worktree_for_id(project_path.worktree_id, cx)
             .and_then(|worktree| worktree.read(cx).status_for_file(&project_path.path))
     }