Add a test framework to test the JS part of the course #6683

Job	Run time
find-languages	7s
format	33s
cargo (ubuntu-latest)	46s
bare-metal (src/bare-metal/alloc-example, aarch64-unknown-none)	36s
cargo (macos-latest)	43s
bare-metal (src/bare-metal/aps/examples, aarch64-unknown-none)	40s
Translation diff	1m 34s
typos	4s
bare-metal (src/bare-metal/microcontrollers/examples, thumbv7em-none-eabihf)	44s
bare-metal (src/exercises/bare-metal/compass, thumbv7em-none-eabihf)	57s
bare-metal (src/exercises/bare-metal/rtc, aarch64-unknown-none)	29s
build (ar)	5m 15s
build (bn)	4m 37s
build (da)	5m 5s
build (de)	5m 34s
build (el)	5m 48s
build (en)	3m 28s
build (es)	5m 10s
build (fa)	5m 23s
build (fr)	5m 33s
build (id)	5m 37s
build (it)	5m 18s
build (ja)	5m 49s
build (ko)	6m 26s
build (pl)	5m 19s
build (pt-BR)	5m 31s
build (ro)	5m 20s
build (ru)	5m 5s
build (tr)	5m 29s
build (uk)	4m 29s
build (vi)	4m 25s
build (zh-CN)	5m 29s
build (zh-TW)	6m 4s
	2h 3m 27s

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