Switch from Nashorn to GraalVM JS engine; support Java 15+ #15708
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I figured out we can use the GraalVM JavaScript engine for our JavaScript execution needs, allowing us to finally remove our Nashorn dep and support Java 15 and 16.
I added tests against Java 16 (current latest) to CI and added Java 8 back which was accidentally changed in #15201.
Fixes #13881
Fixes #15707