Separate repository state synchronization from worktree synchronization (#27140)

This PR updates our DB schemas and wire protocol to separate the
synchronization of git statuses and other repository state from the
synchronization of worktrees. This paves the way for moving the code
that executes git status updates out of the `worktree` crate and onto
the new `GitStore`. That end goal is motivated by two (related) points:

- Disentangling git status updates from the worktree's
`BackgroundScanner` will allow us to implement a simpler concurrency
story for those updates, hopefully fixing some known but elusive bugs
(upstream state not updating after push; statuses getting out of sync in
remote projects).
- By moving git repository state to the project-scoped `GitStore`, we
can get rid of the duplication that currently happens when two worktrees
are associated with the same git repository.

Co-authored-by: Max <max@zed.dev>

Release Notes:

- N/A

---------

Co-authored-by: Max <max@zed.dev>
Co-authored-by: Max Brunsfeld <maxbrunsfeld@gmail.com>

crates/collab/src/db.rs

@@ -9,6 +9,7 @@ use anyhow::anyhow;
 use collections::{BTreeMap, BTreeSet, HashMap, HashSet};
 use dashmap::DashMap;
 use futures::StreamExt;
+use project_repository_statuses::StatusKind;
 use rand::{prelude::StdRng, Rng, SeedableRng};
 use rpc::ExtensionProvides;
 use rpc::{
@@ -36,7 +37,6 @@ use std::{
 };
 use time::PrimitiveDateTime;
 use tokio::sync::{Mutex, OwnedMutexGuard};
-use worktree_repository_statuses::StatusKind;
 use worktree_settings_file::LocalSettingsKind;
 
 #[cfg(test)]
@@ -658,6 +658,8 @@ pub struct RejoinedProject {
     pub old_connection_id: ConnectionId,
     pub collaborators: Vec<ProjectCollaborator>,
     pub worktrees: Vec<RejoinedWorktree>,
+    pub updated_repositories: Vec<proto::UpdateRepository>,
+    pub removed_repositories: Vec<u64>,
     pub language_servers: Vec<proto::LanguageServer>,
 }
 
@@ -726,6 +728,7 @@ pub struct Project {
     pub role: ChannelRole,
     pub collaborators: Vec<ProjectCollaborator>,
     pub worktrees: BTreeMap<u64, Worktree>,
+    pub repositories: Vec<proto::UpdateRepository>,
     pub language_servers: Vec<proto::LanguageServer>,
 }
 
@@ -760,7 +763,7 @@ pub struct Worktree {
     pub root_name: String,
     pub visible: bool,
     pub entries: Vec<proto::Entry>,
-    pub repository_entries: BTreeMap<u64, proto::RepositoryEntry>,
+    pub legacy_repository_entries: BTreeMap<u64, proto::RepositoryEntry>,
     pub diagnostic_summaries: Vec<proto::DiagnosticSummary>,
     pub settings_files: Vec<WorktreeSettingsFile>,
     pub scan_id: u64,
@@ -810,7 +813,7 @@ impl LocalSettingsKind {
 }
 
 fn db_status_to_proto(
-    entry: worktree_repository_statuses::Model,
+    entry: project_repository_statuses::Model,
 ) -> anyhow::Result<proto::StatusEntry> {
     use proto::git_file_status::{Tracked, Unmerged, Variant};