Update: move ServerUpdateOcclusionParallel inside FinalizeTickParallel
- FinalizeTickParallel invalidates players network cache - with UsePlayerUpdateJobs 2 we can skip it later, but 1 is has double-invalidate
This increases the coverage of OcclusionFrameCache, allowing to simplify a bunch of code.
Tests: 2p on Craggy with UsePlayerUpdateJobs 0, 1, 2 and disconnects. 0p server with UsePlayerUpdateJobs 1, 2