Add a typescript test (not just a compile test) for enums #1598

Job	Run time
Rustfmt	13s
Check	1m 8s
Clippy	5m 41s
Run js-sys crate tests	2m 9s
Verify that web-sys is compiled correctly	50s
Run native tests	1m 45s
Run web-sys crate tests	5m 50s
Run wasm-bindgen-webidl crate tests	2m 10s
build_benchmarks	50s
build_examples	3m 39s
build_nightly	1m 32s
Test TypeScript output of wasm-bindgen	1m 21s
Build and test the deno example	57s
Run UI compile-fail tests	1m 20s
dist_linux_aarch64_gnu	2m 52s
dist_linux_x86_64_musl	2m 22s
dist_macos_aarch64	2m 9s
dist_macos_x86_64	1m 51s
doc_api	1m 8s
dist_windows	3m 17s
doc_book	36s
Run wasm-bindgen crate tests with multithreading enabled	1m 39s
Run wasm-bindgen crate tests (unix)	9m 29s
test_examples	2m 16s
deploy	1m 4s
	58m 8s

Provide feedback