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/collab/src/rpc.rs

@@ -691,7 +691,6 @@ impl Server {
         })
     }
 
-    #[allow(clippy::too_many_arguments)]
     pub fn handle_connection(
         self: &Arc<Self>,
         connection: Connection,
@@ -1075,7 +1074,6 @@ pub fn routes(server: Arc<Server>) -> Router<(), Body> {
         .layer(Extension(server))
 }
 
-#[allow(clippy::too_many_arguments)]
 pub async fn handle_websocket_request(
     TypedHeader(ProtocolVersion(protocol_version)): TypedHeader<ProtocolVersion>,
     app_version_header: Option<TypedHeader<AppVersionHeader>>,