Upgrade to URP and latest LTS

[Swiggies]

Feature description

Upgrading the project to use URP should gain a noticeable boost to performance for lower end devices and let us use more rendering features to further optimize the game.

Acceptance criteria/subtasks

• Upgrade to the latest LTS version of Unity.
• Upgrade the rendering pipeline to use the latest version of URP.
• Upgrade all materials, shaders and VFX so the new version has feature parity with the current version.

TODO

• Add the appropriate label for the feature (i.e. environment, user interface, game logic, etc.)
• Add the feature to the "Development Board"