Faster local testing with `reference.rs` (#4255) #2800

Job	Run time
Verify that web-sys is compiled correctly	44s
build_benchmarks	54s
build_nightly	1m 46s
build_examples	3m 45s
Check	1m 3s
Clippy	2m 55s
Clippy (project)	2m 35s
Clippy (web-sys)	2m 30s
dist_linux_aarch64_gnu	3m 28s
dist_linux_x86_64_musl	2m 49s
dist_macos_aarch64	1m 28s
dist_macos_x86_64	1m 16s
dist_windows	4m 13s
doc_api	2m 16s
doc_book	8s
Check MSRV for CLI tools	32s
Check MSRV for libraries	1m 53s
Rustfmt	10s
Taplo	5s
Build and test the deno example	52s
Run native tests	2m 12s
Run wasm-bindgen crate tests with multithreading	3m 21s
Run UI compile-fail tests	47s
Run wasm-bindgen crate tests (wasm-bindgen)	2m 17s
Run wasm-bindgen crate tests (wasm-bindgen (serde-serialize))	1m 20s
Run wasm-bindgen crate tests with externref feature	1m 44s
Run wasm-bindgen wasm test	1m 22s
Run wasm-bindgen crate tests (wasm-bindgen (enable-interning))	1m 44s
Run wasm-bindgen crate tests with multi-value feature	2m 3s
Run web-sys tests (with geckodriver)	31s
Run web-sys (all features) tests (with geckodriver)	2m 44s
Run web-sys (unstable, all features) tests (with geckodriver)	3m 41s
Run js-sys tests (with geckodriver)	1m 33s
Run js-sys (unstable) tests (with geckodriver)	1m 24s
Run wasm-bindgen-webidl tests (with geckodriver)	30s
Run webidl-tests tests (with geckodriver)	1m 5s
Run webidl-tests (unstable) tests (with geckodriver)	1m 18s
Run typescript-tests tests (with geckodriver)	1m 21s
test_nightly	46s
test_examples	1m 45s
deploy	47s
	1h 9m 37s

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