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/image_viewer/src/image_viewer.rs

@@ -2,18 +2,17 @@ use std::path::PathBuf;
 
 use anyhow::Context as _;
 use editor::items::entry_git_aware_label_color;
+use file_icons::FileIcons;
 use gpui::{
     canvas, div, fill, img, opaque_grey, point, size, AnyElement, AppContext, Bounds, EventEmitter,
     FocusHandle, FocusableView, InteractiveElement, IntoElement, Model, ObjectFit, ParentElement,
     Render, Styled, Task, View, ViewContext, VisualContext, WeakView, WindowContext,
 };
 use persistence::IMAGE_VIEWER;
-use theme::Theme;
-use ui::prelude::*;
-
-use file_icons::FileIcons;
 use project::{image_store::ImageItemEvent, ImageItem, Project, ProjectPath};
 use settings::Settings;
+use theme::Theme;
+use ui::prelude::*;
 use util::paths::PathExt;
 use workspace::{
     item::{BreadcrumbText, Item, ProjectItem, SerializableItem, TabContentParams},
@@ -101,7 +100,9 @@ impl Item for ImageView {
             let git_status = self
                 .project
                 .read(cx)
-                .project_path_git_status(&project_path, cx);
+                .project_path_git_status(&project_path, cx)
+                .map(|status| status.summary())
+                .unwrap_or_default();
 
             self.project
                 .read(cx)