Sync JS FBT www and fbsource #2139

Job	Run time
v12.16: babel-plugin-fbt-runtime:test	42s
v12.16: babel-plugin-fbt:test	1m 10s
v12.16: babel-plugin-standalone:test	1m 4s
v12.16: demo-app:test	42s
v12.16: fb-tiger-hash:test	45s
v12.16: flow:check	43s
v12.16: gulp-rewrite-flowtyped-modules:test	41s
v12.16: gulp-strip-docblock-pragmas:test	42s
v12.16: top-level:test	40s
v16.0: babel-plugin-fbt-runtime:test	43s
v16.0: babel-plugin-fbt:test	1m 10s
v16.0: babel-plugin-standalone:test	1m 3s
v16.0: demo-app:test	45s
v16.0: fb-tiger-hash:test	43s
v16.0: flow:check	41s
v16.0: gulp-rewrite-flowtyped-modules:test	40s
v16.0: gulp-strip-docblock-pragmas:test	39s
v16.0: top-level:test	39s
	14m 12s

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