[Gradle, JS] Remove redundant hacks for debug

#KT-37037 fixed

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/testing/mocha/KotlinMocha.kt

@@ -69,21 +69,13 @@ class KotlinMocha(override val compilation: KotlinJsCompilation) :
             .map { npmProject.require(it) }
             .single()
 
-        val adapter = createAdapterJs(file, debug)
+        val adapter = createAdapterJs(file)
 
         val args = mutableListOf(
             "--require",
             npmProject.require("source-map-support/register.js")
         ).apply {
             if (debug) {
-                // Idle run of tests to load file with source maps to enable break points
-                add("--require")
-                add(
-                    npmProject.require("kotlin-test-js-runner/kotlin-test-nodejs-idle-runner.js")
-                )
-                add("--require")
-                add(file)
-
                 add("--inspect-brk")
             }
             add(mocha)
@@ -110,8 +102,7 @@ class KotlinMocha(override val compilation: KotlinJsCompilation) :
     }
 
     private fun createAdapterJs(
-        file: String,
-        debug: Boolean
+        file: String
     ): File {
         val npmProject = compilation.npmProject
 
@@ -120,12 +111,6 @@ class KotlinMocha(override val compilation: KotlinJsCompilation) :
             val adapter = npmProject.require("kotlin-test-js-runner/kotlin-test-nodejs-runner.js")
             val escapedFile = file.jsQuoted()
 
-            if (debug) {
-                // Invalidate caches after idle run
-                writer.println("delete require.cache[require.resolve($escapedFile)]")
-                writer.println("delete require.cache[require.resolve('kotlin-test')]")
-            }
-
             writer.println("require(${adapter.jsQuoted()})")
 
             writer.println("module.exports = require($escapedFile)")