file_finder: Remove common segments of long paths in search results (#25049)

This PR makes progress on #7711 by identifying any common prefix of the
paths in the file finder's search results, and replacing the "interior"
of that prefix---every path segment but the first and last---with `...`,
when a heuristic indicates that the longest path would otherwise
overflow the modal.

The elision is not applied to any segment that contains a match for the
search query.

There may be more work to do on #7711 in the case of long result paths
that do not share a significant common prefix.

Release Notes:

- Improved display of long paths in the file finder modal

Co-authored-by: Max <max@zed.dev>

crates/extension_api/src/extension_api.rs

@@ -191,7 +191,7 @@ static mut EXTENSION: Option<Box<dyn Extension>> = None;
 pub static ZED_API_VERSION: [u8; 6] = *include_bytes!(concat!(env!("OUT_DIR"), "/version_bytes"));
 
 mod wit {
-    #![allow(clippy::too_many_arguments, clippy::missing_safety_doc)]
+    #![allow(clippy::missing_safety_doc)]
 
     wit_bindgen::generate!({
         skip: ["init-extension"],