refact: enable no-unused-vars eslint rule

Author: danielpza

eslint.config.mjs

@@ -26,7 +26,6 @@ export default [
   {
     rules: {
       "@typescript-eslint/no-explicit-any": "off",
-      "@typescript-eslint/no-unused-vars": "warn",
     },
   },
 ];

test/tests/transformer/specific.test.ts

@@ -41,6 +41,7 @@ const moduleAugmentFile = ts.normalizePath(path.join(projectRoot, "src/module-au
 
 declare global {
   namespace jest {
+    // eslint-disable-next-line @typescript-eslint/no-unused-vars -- no way to extend type definitions without using the same declaration as the original types
     interface Matchers<R> {
       transformedMatches(expected: RegExp | string, opt?: { base?: EmittedFiles[]; kind?: ("dts" | "js")[] }): void;
     }