ci: remove `CARGO_FEATURES_OPTION` #339

Job	Run time
cargo fmt --all -- --check	8s
cargo check (ubuntu-latest)	11s
Code Coverage (ubuntu-latest, unix)	26s
cargo clippy -- -D warnings (ubuntu-latest)	8s
cargo check (macOS-latest)	12s
Code Coverage (macos-latest, macos)	29s
GNU test suite	27s
cargo clippy -- -D warnings (macOS-latest)	12s
cargo check (windows-latest)	1m 17s
Code Coverage (windows-latest, windows)	53s
cargo clippy -- -D warnings (windows-latest)	1m 17s
cargo test (ubuntu-latest)	45s
cargo test (macOS-latest)	1m 32s
cargo test (windows-latest)	1m 14s
	9m 11s

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