git: Git Panel UI, continued (#22960)

TODO:

- [ ] Investigate incorrect hit target for `stage all` button
- [ ] Add top level context menu
- [ ] Add entry context menus
- [x] Show paths in list view
- [ ] For now, `enter` can just open the file
- [ ] 🐞: Hover deadzone in list caused by scrollbar
- [x] 🐞: Incorrect status/nothing shown when multiple worktrees are
added

---

This PR continues work on the feature flagged git panel.

Changes:
- Defines and wires up git panel actions & keybindings
- Re-scopes some actions from `git_ui` -> `git`.
- General git actions (StageAll, CommitChanges, ...) are scoped to
`git`.
- Git panel specific actions (Close, FocusCommitEditor, ...) are scoped
to `git_panel.
- Staging actions & UI are now connected to git!
- Unify more reusable git status into the GitState global over being
tied to the panel directly.
- Uses the new git status codepaths instead of filtering all workspace
entries

Release Notes:

- N/A

---------

Co-authored-by: Cole Miller <53574922+cole-miller@users.noreply.github.com>
Co-authored-by: Cole Miller <cole@zed.dev>

assets/keymaps/default-macos.json

@@ -682,6 +682,38 @@
       "space": "project_panel::Open"
     }
   },
+  {
+    "context": "GitPanel && !CommitEditor",
+    "use_key_equivalents": true,
+    "bindings": {
+      "escape": "git_panel::Close"
+    }
+  },
+  {
+    "context": "GitPanel && ChangesList",
+    "use_key_equivalents": true,
+    "bindings": {
+      "up": "menu::SelectPrev",
+      "down": "menu::SelectNext",
+      "cmd-up": "menu::SelectFirst",
+      "cmd-down": "menu::SelectLast",
+      "enter": "menu::Confirm",
+      "space": "git::ToggleStaged",
+      "cmd-shift-space": "git::StageAll",
+      "ctrl-shift-space": "git::UnstageAll",
+      "alt-down": "git_panel::FocusEditor"
+    }
+  },
+  {
+    "context": "GitPanel && CommitEditor > Editor",
+    "use_key_equivalents": true,
+    "bindings": {
+      "alt-up": "git_panel::FocusChanges",
+      "escape": "git_panel::FocusChanges",
+      "cmd-enter": "git::CommitChanges",
+      "cmd-alt-enter": "git::CommitAllChanges"
+    }
+  },
   {
     "context": "CollabPanel && not_editing",
     "use_key_equivalents": true,