file_finder: Respect .gitignore and file_scan_inclusions with ** in glob (#40654)

Closes #39037 

Previously, the code split the `**/.env` glob in `file_scan_inclusions`
into two sources for the `PathMatcher`: `["**", "**/.env"]`. This
approach works for directories, but including `**` will match all
directories and their files. To address this, I now select the
appropriate `PathMatcher` using only `**/.env` when specifically
targeting a file to determine whether to include it in the file finder.

Release Notes:

- Fixed: respect `.gitignore` and `file_scan_inclusions` settings with
`**` in glob for file finder

---------

Signed-off-by: Benjamin <5719034+bnjjj@users.noreply.github.com>
Co-authored-by: Julia Ryan <juliaryan3.14@gmail.com>

crates/util/src/paths.rs

@@ -1573,6 +1573,21 @@ mod tests {
         );
     }
 
+    #[perf]
+    fn file_in_dirs() {
+        let path = Path::new("/work/.env");
+        let path_matcher = PathMatcher::new(&["**/.env".to_owned()], PathStyle::Posix).unwrap();
+        assert!(
+            path_matcher.is_match(path),
+            "Path matcher should match {path:?}"
+        );
+        let path = Path::new("/work/package.json");
+        assert!(
+            !path_matcher.is_match(path),
+            "Path matcher should not match {path:?}"
+        );
+    }
+
     #[perf]
     fn project_search() {
         let path = Path::new("/Users/someonetoignore/work/zed/zed.dev/node_modules");