[optimizer] run webpack compilation ASAP (no more laziness) #15795
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The "lazy" optimizer currently delays compilation until a request for build output is received. This prevents webpack from compiling constantly in the background, but also makes refresh times slower. Several people have said that they would prefer it be done the other way around, and just about every other watching compiler does it this way, so this pr removes that feature.
Changes will now immediately trigger a compilation and refreshes will be a little faster because compilation will either be complete or in progress before the refresh is actually started.