[Fizz][Float] stop preloading stylesheets that are not stylesheet resources (#26873)

We previously preloaded stylesheets that were rendered in Fizz. The idea
was we'd get a headstart fetching these resources since we know they are
going to be rendered. However to really be effective non-float
stylesheets need to rendered in the head and the preload here is not
helpful and potentially hurtful to perf in a minor way. This change
removes this functionality to make the code smaller and simpler