chore: address clippy warnings

crates/datadog-trace-agent/src/config.rs

@@ -23,6 +23,12 @@ pub struct Tags {
     function_tags_string: OnceLock<String>,
 }
 
+impl Default for Tags {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl Tags {
     pub fn from_env_string(env_tags: &str) -> Self {
         let mut tags = HashMap::new();

crates/datadog-trace-agent/src/mini_agent.rs

@@ -177,6 +177,7 @@ impl MiniAgent {
         }
     }
 
+    #[allow(clippy::too_many_arguments)]
     async fn trace_endpoint_handler(
         config: Arc<config::Config>,
         req: hyper_migration::HttpRequest,

crates/datadog-trace-agent/src/trace_processor.rs

@@ -104,7 +104,7 @@ impl TraceProcessor for ServerlessTraceProcessor {
         // double check content length is < max request content length in case transfer encoding is used
         if body_size > config.max_request_content_length {
             return log_and_create_http_response(
-                &format!("Error processing traces: Payload too large"),
+                "Error processing traces: Payload too large",
                 StatusCode::PAYLOAD_TOO_LARGE,
             );
         }