Don't load the shader cache on a separate thread - all it does is already async #18216
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Since some time, all the shader cache load has really done in practice is to spawn asynchronous tasks, so it itself runs really quickly.
Gets rid of a mutex and should remove some additional potential for sync bugs, although I think I fixed most of them in the last PR.
We already have to properly handle shutdown of all the async tasks, no need to add another layer of async-ness and locks.