Skip disabled key-value entries during request rendering

Skip disabled headers, metadata, URL parameters, and form body
entries in the render phase for HTTP, gRPC, and WebSocket requests.
Previously, disabled entries were still template-rendered even though
they were filtered out later at the use site.

crates/yaak-ws/src/render.rs

@@ -16,6 +16,9 @@ pub async fn render_websocket_request<T: TemplateCallback>(
 
     let mut url_parameters = Vec::new();
     for p in r.url_parameters.clone() {
+        if !p.enabled {
+            continue;
+        }
         url_parameters.push(HttpUrlParameter {
             enabled: p.enabled,
             name: parse_and_render(&p.name, vars, cb, opt).await?,
@@ -26,6 +29,9 @@ pub async fn render_websocket_request<T: TemplateCallback>(
 
     let mut headers = Vec::new();
     for p in r.headers.clone() {
+        if !p.enabled {
+            continue;
+        }
         headers.push(HttpRequestHeader {
             enabled: p.enabled,
             name: parse_and_render(&p.name, vars, cb, opt).await?,