Add a typescript test (not just a compile test) for enums #1764

Job	Run time
build_examples	3m 15s
build_nightly	1m 30s
build_benchmarks	51s
Check	55s
Verify that web-sys is compiled correctly	45s
Clippy	5m 7s
dist_linux_aarch64_gnu	3m 12s
dist_linux_x86_64_musl	2m 25s
dist_macos_aarch64	3m 5s
dist_macos_x86_64	3m 8s
dist_windows	3m 30s
doc_api	1m 13s
doc_book	37s
Rustfmt	6s
Build and test the deno example	52s
Run js-sys crate tests	2m 9s
Run native tests	1m 40s
Run wasm-bindgen crate tests with multithreading enabled	1m 20s
Test TypeScript output of wasm-bindgen	1m 26s
Run UI compile-fail tests	3m 40s
Run wasm-bindgen crate tests (unix)	6m 16s
Run web-sys crate tests	4m 16s
Run wasm-bindgen-webidl crate tests	2m 5s
test_examples	2m 7s
deploy	55s
	56m 25s

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