Calling DynamicGI.UpdateEnvironment:
- updates the ambient probe by rendering the skybox on the GPU, reading back and projecting it into SH (same as the ambient probe job does)
- tells Enlighten that the environment could have changed, so we pass it to Enlighten anew – and that can affect realtime lightmaps and realtime light probes.
It should also update the default reflection if the mode is set to "skybox" (not "custom").