Remove `test-log` and `env_logger`. #232

Job	Run time
cargo fmt	12s
cargo doc (windows-latest)	2m 44s
cargo clippy + test (windows-latest)	4m 49s
cargo doc (macos-latest)	3m 58s
cargo clippy + test (macos-latest)	6m 18s
cargo doc (ubuntu-latest)	1m 29s
cargo clippy + test (ubuntu-latest)	3m 20s
	22m 50s

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