Add JSDoc annotations to ensure enums type check even without `.d.ts` file #2673

Job	Run time
Check	1m 1s
Clippy (project)	2m 27s
Clippy	2m 53s
Clippy (web-sys)	2m 33s
Rustfmt	6s
Taplo	5s
Run wasm-bindgen crate tests (wasm-bindgen)	2m 7s
Run wasm-bindgen crate tests with externref feature	1m 32s
Run wasm-bindgen wasm test	1m 11s
Run wasm-bindgen crate tests (wasm-bindgen (serde-serialize))	3m 24s
Run wasm-bindgen crate tests with multi-value feature	1m 30s
Run wasm-bindgen crate tests (wasm-bindgen (enable-interning))	1m 30s
build_benchmarks	51s
build_examples	3m 31s
build_nightly	1m 34s
Verify that web-sys is compiled correctly	52s
dist_linux_aarch64_gnu	3m 56s
dist_linux_x86_64_musl	2m 33s
dist_macos_x86_64	1m 21s
Build and test the deno example	1m 14s
Run native tests	2m 6s
Run wasm-bindgen crate tests with multithreading	1m 26s
Run UI compile-fail tests	52s
Run web-sys tests (with geckodriver)	43s
dist_macos_aarch64	1m 36s
Run web-sys (all features) tests (with geckodriver)	4m 48s
Run web-sys (unstable, all features) tests (with geckodriver)	3m 32s
dist_windows	4m 17s
doc_api	1m 12s
Run js-sys tests (with geckodriver)	1m 14s
Run js-sys (unstable) tests (with geckodriver)	1m 32s
doc_book	4s
Run wasm-bindgen-webidl tests (with geckodriver)	56s
Check MSRV for CLI tools	33s
Run webidl-tests tests (with geckodriver)	1m 11s
Run webidl-tests (unstable) tests (with geckodriver)	1m 17s
Check MSRV for libraries	1m 38s
Run typescript-tests tests (with geckodriver)	1m 27s
test_nightly	43s
test_examples	1m 40s
deploy	36s
	1h 9m 34s

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