Revert "lsp: Watch paths outside of worktrees at language servers request (#17173) (#17206)

This PR reverts #17173, as it introduced a segfault when opening any
Gleam project and the language server starts up.

This reverts commit a850731b0e.

Release Notes:

- N/A

crates/snippet_provider/src/lib.rs

@@ -169,12 +169,7 @@ impl SnippetProvider {
 
             let (mut entries, _) = watcher.await;
             while let Some(entries) = entries.next().await {
-                process_updates(
-                    this.clone(),
-                    entries.into_iter().map(|event| event.path).collect(),
-                    cx.clone(),
-                )
-                .await?;
+                process_updates(this.clone(), entries, cx.clone()).await?;
             }
             Ok(())
         })