Add file_scan_inclusions setting to customize Zed file indexing (#16852)

Closes #4745

Release Notes:

- Added a new `file_scan_inclusions` setting to force Zed to index files
that match the provided globs, even if they're gitignored.

---------

Co-authored-by: Mikayla Maki <mikayla@zed.dev>

crates/project_panel/src/project_panel.rs

@@ -2033,6 +2033,7 @@ impl ProjectPanel {
                         is_ignored: entry.is_ignored,
                         is_external: false,
                         is_private: false,
+                        is_always_included: entry.is_always_included,
                         git_status: entry.git_status,
                         canonical_path: entry.canonical_path.clone(),
                         char_bag: entry.char_bag,