Add truncate_str_short() which always returns a prefix of the input #2099

Job	Run time
Code coverage	2m 50s
Clippy	40s
Rustfmt	12s
Integration tests (macos-latest)	1m 47s
Integration tests (ubuntu-latest)	2m 6s
Unit tests (macos-latest, aarch64-apple-darwin, false)	2m 6s
Unit tests (macos-12, x86_64-apple-darwin, false)	3m 14s
Unit tests (windows-latest, x86_64-pc-windows-msvc, false)	6m 24s
Unit tests (ubuntu-latest, x86_64-unknown-linux-gnu, false)	2m 18s
Unit tests (ubuntu-latest, x86_64-unknown-linux-musl, true)	2m 49s
Unit tests (ubuntu-latest, i686-unknown-linux-gnu, true)	2m 43s
Unit tests (ubuntu-latest, arm-unknown-linux-gnueabihf, true)	3m 31s
Unit tests (ubuntu-latest, aarch64-unknown-linux-gnu, true)	2m 50s
	33m 30s

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