improved error reporting for UnwrapThrowExt for Result #2222

Job	Run time
Clippy	6m 52s
Run native tests	1m 51s
Rustfmt	10s
Check	1m 9s
Run wasm-bindgen crate tests with multithreading enabled	1m 26s
Run wasm-bindgen crate tests (unix)	10m 46s
Run web-sys crate tests	5m 41s
Verify that web-sys is compiled correctly	48s
Build and test the deno example	1m 5s
Run js-sys crate tests	2m 17s
Test TypeScript output of wasm-bindgen	1m 27s
Run UI compile-fail tests	1m 7s
Run wasm-bindgen-webidl crate tests	2m 24s
build_benchmarks	1m 2s
build_nightly	1m 38s
build_examples	3m 58s
dist_linux_aarch64_gnu	2m 52s
dist_linux_x86_64_musl	2m 30s
dist_macos_aarch64	1m 44s
dist_macos_x86_64	1m 36s
dist_windows	3m 3s
doc_book	5s
doc_api	1m 11s
test_examples	1m 46s
deploy	28s
	58m 56s

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