edit prediction: Fix license detection error logging + check for different spellings (#24281)

Follow-up to https://github.com/zed-industries/zed/pull/24278

This PR ensures we're checking if there's a license-type file in both US
& UK English spelling, and fixes the error logging again, treating for
when the worktree contains just a single file or multiple.

Release Notes:

- N/A

Co-authored-by: Bennet Bo Fenner <53836821+bennetbo@users.noreply.github.com>

crates/zeta/src/zeta.rs

@@ -953,20 +953,33 @@ impl LicenseDetectionWatcher {
     pub fn new(worktree: &Worktree, cx: &mut Context<Worktree>) -> Self {
         let (mut is_open_source_tx, is_open_source_rx) = watch::channel_with::<bool>(false);
 
-        let loaded_file_fut = worktree.load_file(Path::new("LICENSE"), cx);
+        const LICENSE_FILES_TO_CHECK: [&'static str; 2] = ["LICENSE", "LICENCE"]; // US and UK English spelling
+
+        // Check if worktree is a single file, if so we do not need to check for a LICENSE file
+        let task = if worktree.abs_path().is_file() {
+            Task::ready(())
+        } else {
+            let loaded_files_task = futures::future::join_all(
+                LICENSE_FILES_TO_CHECK
+                    .iter()
+                    .map(|file| worktree.load_file(Path::new(file), cx)),
+            );
+
+            cx.background_executor().spawn(async move {
+                for loaded_file in loaded_files_task.await {
+                    if let Some(content) = loaded_file.log_err() {
+                        if is_license_eligible_for_data_collection(&content.text) {
+                            *is_open_source_tx.borrow_mut() = true;
+                            break;
+                        }
+                    }
+                }
+            })
+        };
 
         Self {
             is_open_source_rx,
-            _is_open_source_task: cx.spawn(|_, _| async move {
+            _is_open_source_task: task,
-                let Ok(loaded_file) = loaded_file_fut.await else {
-                    return;
-                };
-
-                let is_loaded_file_open_source_thing: bool =
-                    is_license_eligible_for_data_collection(&loaded_file.text);
-
-                *is_open_source_tx.borrow_mut() = is_loaded_file_open_source_thing;
-            }),
         }
     }