feat: remove last usages of `OCKAM_LOG` env var #29932

Job	Run time
Rust - build	2m 56s
Rust - check_cargo_update	2m 25s
Rust - check_no_std	1m 37s
Rust - lint_cargo_readme	48s
Rust - check_nightly	2m 24s
Rust - build_docs	1m 37s
Rust - lint_cargo_fmt_check	1m 3s
Rust - build_examples	3m 2s
Rust - lint_cargo_clippy	3m 0s
Rust - build_nightly	3m 47s
Rust - lint_cargo_deny	54s
Rust - ockam_command_cross_build (linux_armv7)	6m 12s
Rust - build_release	6m 12s
Rust - lint_cargo_toml_files	46s
Rust - ockam_command_cross_build (macos_silicon)	6m 13s
Rust - test	6m 15s
Rust - lint_cargo_machete	56s
Rust - test_nightly	6m 14s
Rust - test_ockam_command (linux_86)	6m 20s
Rust - test_postgres	6m 14s
	1h 8m 55s

Provide feedback