ci: use `-Cinstrument-coverage` instead of `-Zprofile` #1297

Job	Run time
cargo clippy -- -D warnings	30s
cargo check (ubuntu-latest)	12s
cargo check (macOS-latest)	16s
cargo fmt --all -- --check	6s
cargo check (windows-latest)	33s
Code coverage (ubuntu-latest, nightly, --all-features)	5s
cargo test (ubuntu-latest)	33s
cargo test (macOS-latest)	34s
cargo test (windows-latest)	31s
	3m 20s

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