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/fs/src/fs.rs

@@ -5,6 +5,8 @@ mod mac_watcher;
 pub mod fs_watcher;
 
 use anyhow::{anyhow, Result};
+#[cfg(any(test, feature = "test-support"))]
+use git::status::FileStatus;
 use git::GitHostingProviderRegistry;
 
 #[cfg(any(target_os = "linux", target_os = "freebsd"))]
@@ -41,7 +43,7 @@ use util::ResultExt;
 #[cfg(any(test, feature = "test-support"))]
 use collections::{btree_map, BTreeMap};
 #[cfg(any(test, feature = "test-support"))]
-use git::repository::{FakeGitRepositoryState, GitFileStatus};
+use git::repository::FakeGitRepositoryState;
 #[cfg(any(test, feature = "test-support"))]
 use parking_lot::Mutex;
 #[cfg(any(test, feature = "test-support"))]
@@ -1285,11 +1287,11 @@ impl FakeFs {
     pub fn set_status_for_repo_via_working_copy_change(
         &self,
         dot_git: &Path,
-        statuses: &[(&Path, GitFileStatus)],
+        statuses: &[(&Path, FileStatus)],
     ) {
         self.with_git_state(dot_git, false, |state| {
-            state.worktree_statuses.clear();
-            state.worktree_statuses.extend(
+            state.statuses.clear();
+            state.statuses.extend(
                 statuses
                     .iter()
                     .map(|(path, content)| ((**path).into(), *content)),
@@ -1305,11 +1307,11 @@ impl FakeFs {
     pub fn set_status_for_repo_via_git_operation(
         &self,
         dot_git: &Path,
-        statuses: &[(&Path, GitFileStatus)],
+        statuses: &[(&Path, FileStatus)],
     ) {
         self.with_git_state(dot_git, true, |state| {
-            state.worktree_statuses.clear();
-            state.worktree_statuses.extend(
+            state.statuses.clear();
+            state.statuses.extend(
                 statuses
                     .iter()
                     .map(|(path, content)| ((**path).into(), *content)),