Refactor HTTP request handling in InvokeRecActionCommand

Replaced the `reqMsg` variable with `httpReq` to simplify the
creation and usage of `HttpRequestMessage`. The `request.RestType`
is now used directly to create `httpReq`, which is passed to
`http.SendAsync`. This change reduces redundancy and improves
code clarity.

src/ReC.Application/RecActions/Commands/InvokeRecActionCommand.cs

@@ -36,11 +36,11 @@ public class InvokeRecActionCommandHandler(
             return;
         }
 
-        using var reqMsg = request.RestType
+        using var httpReq = request.RestType
             .ToHttpMethod()
             .ToHttpRequestMessage(request.EndpointUri);
 
-        using var response = await http.SendAsync(reqMsg, cancel);
+        using var response = await http.SendAsync(httpReq, cancel);
         var body = await response.Content.ReadAsStringAsync(cancel);
         var headers = response.Headers.ToDictionary();
     }