Emit http_request_fail notification

CDP translate this into a Network.loadingFailed. This is necessary to make sure
every Network.requestWillBeSent is paired with either a Network.loadingFailed
or a Network.responseReceived.

src/runtime/loop.zig

@@ -127,7 +127,6 @@ pub const Loop = struct {
         }
     }
 
-
     // JS callbacks APIs
     // -----------------
 
@@ -255,7 +254,6 @@ pub const Loop = struct {
             }
         }.onConnect;
 
-
         const callback = try self.event_callback_pool.create();
         errdefer self.event_callback_pool.destroy(callback);
         callback.* = .{ .loop = self, .ctx = ctx };