🚨(linter) add ignore pattern on no-unused-vars rule

The rule @typescript-eslint/no-unused-vars didn't
have a ignore pattern. A ignore pattern can be
usefull in some cases.

src/frontend/packages/eslint-config-impress/common.js

@@ -13,6 +13,10 @@ const eslintTS = [
     rules: {
       '@typescript-eslint/no-explicit-any': 'error',
       '@typescript-eslint/no-non-null-assertion': 'error',
+      '@typescript-eslint/no-unused-vars': [
+        'error',
+        { varsIgnorePattern: '^_', argsIgnorePattern: '^_' },
+      ],
       'sort-imports': [
         'error',
         {