Add Project Panel navigation actions in netrw mode (#20941)

Release Notes:

- Added "[ c" & "] c" To select prev/next git modified file within the
project panel
- Added "[ d" & "] d" To select prev/next file with diagnostics from an
LSP within the project panel
- Added "{" & "}" To select prev/next directory within the project panel

Note:

I wanted to extend project panel's functionality when netrw is active so
I added some shortcuts that I believe will be helpful for most users. I
tried to keep the default key mappings for the shortcuts inline with
Zed's vim mode.

## Selecting prev/next modified git file

https://github.com/user-attachments/assets/a9c057c7-1015-444f-b273-6d52ac54aa9c


## Selecting prev/next diagnostics 

https://github.com/user-attachments/assets/d1fb04ac-02c6-477c-b751-90a11bb42a78

## Selecting prev/next directories (Only works with visible directoires)

https://github.com/user-attachments/assets/9e96371e-105f-4fe9-bbf7-58f4a529f0dd

assets/keymaps/vim.json

@@ -659,6 +659,12 @@
       "p": "project_panel::Open",
       "x": "project_panel::RevealInFileManager",
       "s": "project_panel::OpenWithSystem",
+      "] c": "project_panel::SelectNextGitEntry",
+      "[ c": "project_panel::SelectPrevGitEntry",
+      "] d": "project_panel::SelectNextDiagnostic",
+      "[ d": "project_panel::SelectPrevDiagnostic",
+      "}": "project_panel::SelectNextDirectory",
+      "{": "project_panel::SelectPrevDirectory",
       "shift-g": "menu::SelectLast",
       "g g": "menu::SelectFirst",
       "-": "project_panel::SelectParent",