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/git_ui/src/git_ui.rs

@@ -2,7 +2,8 @@ use ::settings::Settings;
 use collections::HashMap;
 use futures::channel::mpsc;
 use futures::StreamExt as _;
-use git::repository::{GitFileStatus, GitRepository, RepoPath};
+use git::repository::{GitRepository, RepoPath};
+use git::status::FileStatus;
 use git_panel_settings::GitPanelSettings;
 use gpui::{actions, AppContext, Hsla, Model};
 use project::{Project, WorktreeId};
@@ -223,17 +224,15 @@ const REMOVED_COLOR: Hsla = Hsla {
 };
 
 // TODO: Add updated status colors to theme
-pub fn git_status_icon(status: GitFileStatus) -> impl IntoElement {
-    match status {
-        GitFileStatus::Added | GitFileStatus::Untracked => {
-            Icon::new(IconName::SquarePlus).color(Color::Custom(ADDED_COLOR))
-        }
-        GitFileStatus::Modified => {
-            Icon::new(IconName::SquareDot).color(Color::Custom(MODIFIED_COLOR))
-        }
-        GitFileStatus::Conflict => Icon::new(IconName::Warning).color(Color::Custom(REMOVED_COLOR)),
-        GitFileStatus::Deleted => {
-            Icon::new(IconName::SquareMinus).color(Color::Custom(REMOVED_COLOR))
-        }
-    }
+pub fn git_status_icon(status: FileStatus) -> impl IntoElement {
+    let (icon_name, color) = if status.is_conflicted() {
+        (IconName::Warning, REMOVED_COLOR)
+    } else if status.is_deleted() {
+        (IconName::SquareMinus, REMOVED_COLOR)
+    } else if status.is_modified() {
+        (IconName::SquareDot, MODIFIED_COLOR)
+    } else {
+        (IconName::SquarePlus, ADDED_COLOR)
+    };
+    Icon::new(icon_name).color(Color::Custom(color))
 }