Add an undo button to the git panel (#24593)

Also prep infrastructure for pushing a commit

Release Notes:

- N/A

---------

Co-authored-by: Conrad Irwin <conrad.irwin@gmail.com>
Co-authored-by: Conrad <conrad@zed.dev>
Co-authored-by: Nate Butler <iamnbutler@gmail.com>

crates/collab/src/db/tables/worktree_repository.rs

@@ -15,6 +15,8 @@ pub struct Model {
     pub is_deleted: bool,
     // JSON array typed string
     pub current_merge_conflicts: Option<String>,
+    // A JSON object representing the current Branch values
+    pub branch_summary: Option<String>,
 }
 
 #[derive(Copy, Clone, Debug, EnumIter, DeriveRelation)]