fix(@angular-devkit/build-angular): fully optimize script bundles with bundle downleveling #15566
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Script bundles were not being subject to the terser mangle optimizations when using bundle down leveling.
This change also allows terser to perform ECMA 6 level compress and output optimizations on the actual application bundles (non-script bundles) which can provide for further size improvements. Also limits the parsing for optimizations of the script bundles to one step.
Fixes #15489
Supersedes #15507