Deprecate `--keep-debug` flag #1903

Job	Run time
Check	1m 26s
Check	1m 26s
build_nightly	1m 28s
build_nightly	1m 28s
build_examples	2m 50s
build_examples	2m 52s
build_benchmarks	1m 2s
build_benchmarks	1m 2s
Verify that web-sys is compiled correctly	49s
Verify that web-sys is compiled correctly	49s
Clippy	5m 10s
Clippy	5m 10s
dist_linux_aarch64_gnu	2m 56s
dist_linux_aarch64_gnu	2m 56s
dist_linux_x86_64_musl	2m 58s
dist_linux_x86_64_musl	2m 58s
dist_macos_aarch64	1m 52s
dist_macos_aarch64	1m 52s
dist_windows	3m 46s
dist_windows	3m 46s
doc_api	1m 10s
doc_api	1m 10s
dist_macos_x86_64	3m 43s
dist_macos_x86_64	3m 43s
doc_book	4s
doc_book	4s
Rustfmt	8s
Rustfmt	8s
Run js-sys crate tests	1m 57s
Run js-sys crate tests	1m 57s
Build and test the deno example	1m 13s
Build and test the deno example	1m 13s
Run native tests	2m 25s
Run native tests	2m 25s
Run wasm-bindgen crate tests with multithreading enabled	1m 45s
Run wasm-bindgen crate tests with multithreading enabled	1m 45s
Test TypeScript output of wasm-bindgen	1m 40s
Test TypeScript output of wasm-bindgen	1m 40s
Run UI compile-fail tests	42s
Run UI compile-fail tests	42s
Run wasm-bindgen crate tests (unix)	7m 16s
Run wasm-bindgen crate tests (unix)	7m 16s
Run web-sys crate tests	7m 49s
Run web-sys crate tests	7m 49s
Run wasm-bindgen-webidl crate tests	2m 24s
Run wasm-bindgen-webidl crate tests	2m 24s
test_examples	0s
test_examples	0s
deploy	0s
deploy	0s
	1h 53m 8s

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