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/assistant/src/inline_assistant.rs

@@ -387,7 +387,6 @@ impl InlineAssistant {
         }
     }
 
-    #[allow(clippy::too_many_arguments)]
     pub fn suggest_assist(
         &mut self,
         editor: &Entity<Editor>,
@@ -1674,7 +1673,6 @@ impl Focusable for PromptEditor {
 impl PromptEditor {
     const MAX_LINES: u8 = 8;
 
-    #[allow(clippy::too_many_arguments)]
     fn new(
         id: InlineAssistId,
         gutter_dimensions: Arc<Mutex<GutterDimensions>>,
@@ -2333,7 +2331,6 @@ struct InlineAssist {
 }
 
 impl InlineAssist {
-    #[allow(clippy::too_many_arguments)]
     fn new(
         assist_id: InlineAssistId,
         group_id: InlineAssistGroupId,