refactor: streamline debug logging

lib/config/presets.js

lib/datasource/npm.js

lib/manager/_helpers/node/package.js

lib/manager/index.js

lib/platform/github/index.js

lib/workers/branch/lock-files.js

lib/workers/branch/schedule.js

lib/workers/package-file/package.js

lib/workers/pr/changelog.js

lib/workers/pr/release-notes.js

lib/workers/repository/updates/generate.js

lib/workers/repository/updates/semantic.js

lib/workers/repository/validate.js