Remove Callback from Event batch_* methods

[Structed]

godot-playfab version

<=1.3

Godot version

4.x

System information

Win 11

Issue description

Callbacks provided as parameters to PlayFabEvent.batch_* methods are being disregarded.

The callbacks should be removed, as there is no purpose in calling them, as it's only batching events.

Thanks to AiurTemplar for reporting this in #143

Steps to reproduce

N/A

Minimal reproduction project

N/A