[Gradle, JS] Remove idle test runner

#KT-37037 fixed

libraries/tools/kotlin-test-js-runner/nodejs-idle.ts

@@ -1,14 +0,0 @@
-import {KotlinTestRunner} from "./src/KotlinTestRunner";
-
-const kotlin_test = require('kotlin-test');
-
-const nothingTest: KotlinTestRunner = {
-    suite(name: string, isIgnored: boolean, fn: () => void): void {
-        // do nothing
-    },
-    test(name: string, isIgnored: boolean, fn: () => void): void {
-        // do nothing
-    }
-};
-
-kotlin_test.setAdapter(nothingTest);

libraries/tools/kotlin-test-js-runner/rollup.config.js

@@ -16,16 +16,6 @@ export default [
         },
         plugins: plugins()
     },
-    {
-        input: './nodejs-idle.ts',
-        output: {
-            file: 'lib/kotlin-test-nodejs-idle-runner.js',
-            format: 'cjs',
-            banner: '#!/usr/bin/env node',
-            sourcemap: true
-        },
-        plugins: plugins()
-    },
     {
         input: './karma.ts',
         output: {