Use GHA log grouping #2852

Job	Run time
test_llvm	6m 22s
rustfmt	39s
bench	10m 34s
dist (ubuntu-20.04, x86_64-unknown-linux-gnu)	2m 50s
dist (macos-latest, x86_64-apple-darwin)	4m 5s
dist (ubuntu-latest, x86_64-pc-windows-gnu)	3m 41s
dist (windows-latest, x86_64-pc-windows-msvc)	6m 6s
dist (windows-latest, x86_64-pc-windows-gnu)	5m 35s
test (ubuntu-latest, x86_64-unknown-linux-gnu)	11m 53s
test (macos-latest, x86_64-apple-darwin)	16m 32s
test (ubuntu-latest, x86_64-pc-windows-gnu)	13m 15s
test (ubuntu-latest, aarch64-unknown-linux-gnu)	7m 43s
test (ubuntu-latest, s390x-unknown-linux-gnu)	6m 50s
test (windows-latest, x86_64-pc-windows-msvc)	18m 32s
test (windows-latest, x86_64-pc-windows-gnu)	33m 21s
release	0s
	2h 27m 58s

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