Improve blame file type detection (#1803) #2231

Job	Run time
Rustfmt	6s
Clippy	37s
Integration tests (macos-latest)	1m 50s
Code coverage	3m 25s
Unit tests (macos-latest, aarch64-apple-darwin, false)	2m 59s
Integration tests (ubuntu-latest)	2m 12s
Unit tests (macos-12, x86_64-apple-darwin, false)	3m 33s
Unit tests (windows-latest, x86_64-pc-windows-msvc, false)	6m 24s
Unit tests (ubuntu-latest, x86_64-unknown-linux-gnu, false)	2m 28s
Unit tests (ubuntu-latest, x86_64-unknown-linux-musl, true)	3m 1s
Unit tests (ubuntu-latest, i686-unknown-linux-gnu, true)	2m 54s
Unit tests (ubuntu-latest, arm-unknown-linux-gnueabihf, true)	3m 12s
Unit tests (ubuntu-latest, aarch64-unknown-linux-gnu, true)	3m 28s
	36m 9s

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