Fix tools' ui_text to use inline code escaping (#27543)

Markdown escaping was added in #27502.

Release Notes:

- N/A

crates/assistant_tools/src/diagnostics_tool.rs

@@ -66,11 +66,11 @@ impl Tool for DiagnosticsTool {
         if let Some(path) = serde_json::from_value::<DiagnosticsToolInput>(input.clone())
             .ok()
             .and_then(|input| match input.path {
-                Some(path) if !path.is_empty() => Some(MarkdownString::escape(&path)),
+                Some(path) if !path.is_empty() => Some(MarkdownString::inline_code(&path)),
                 _ => None,
             })
         {
-            format!("Check diagnostics for `{path}`")
+            format!("Check diagnostics for {path}")
         } else {
             "Check project diagnostics".to_string()
         }