Improve blame file type detection (#1803) #2232

Job	Run time
Clippy	37s
Integration tests (macos-latest)	2m 1s
Code coverage	2m 58s
Rustfmt	3s
Integration tests (ubuntu-latest)	2m 10s
Unit tests (macos-latest, aarch64-apple-darwin, false)	2m 46s
Unit tests (macos-12, x86_64-apple-darwin, false)	8m 18s
Unit tests (windows-latest, x86_64-pc-windows-msvc, false)	6m 36s
Unit tests (ubuntu-latest, x86_64-unknown-linux-gnu, false)	2m 35s
Unit tests (ubuntu-latest, x86_64-unknown-linux-musl, true)	3m 11s
Unit tests (ubuntu-latest, i686-unknown-linux-gnu, true)	2m 53s
Unit tests (ubuntu-latest, arm-unknown-linux-gnueabihf, true)	3m 8s
Unit tests (ubuntu-latest, aarch64-unknown-linux-gnu, true)	3m 22s
	40m 38s

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