Add `Latest` file name version of builds for Desktop and Android

[MinecraftPublisher]

This change basically allows different automated distribution systems (such as Flatpak, or maybe an Android source repository) to target the latest version tag and not be required to pull the manifest data from Github in order to get the latest build number to then pull that file name from the Github releases

Example:

https://github.com/Anuken/MindustryBuilds/releases/latest/download/Mindustry-BE-Desktop-Latest.jar