maint/dev ~ 'warn' (instead of 'error') on unused ESLint comments

- allows increased flexibility when using various automated quality analyzers

.eslintrc.js

@@ -24,7 +24,7 @@ module.exports = {
 			{ argsIgnorePattern: '^_', varsIgnorePattern: '^_' },
 		],
 		'eslint-comments/disable-enable-pair': ['error', { allowWholeFile: true }],
-		'eslint-comments/no-unused-disable': 'error',
+		'eslint-comments/no-unused-disable': 'warn',
 		'import/order': ['error', { 'newlines-between': 'always', alphabetize: { order: 'asc' } }],
 		'no-undefined': ['error'], // ref: https://eslint.org/docs/rules/no-undefined
 		'no-unused-vars': ['error', { argsIgnorePattern: '^_', varsIgnorePattern: '^_' }], // ref: https://eslint.org/docs/rules/no-unused-vars