Remove obsolete :kotlinx-benchmark-plugin tests

They were replaced with :integration tests

Author: Abduqodiri Qurbonzoda

plugin/build.gradle

@@ -84,15 +84,6 @@ dependencies {
     compileOnly group: 'org.jetbrains.kotlin.multiplatform', name: 'org.jetbrains.kotlin.multiplatform.gradle.plugin', version: kotlin_version
     compileOnly "org.jetbrains.kotlin:kotlin-compiler-embeddable:$kotlin_version"
     compileOnly "org.openjdk.jmh:jmh-generator-bytecode:$jmhVersion" // used in worker
-
-    testImplementation "org.jetbrains.kotlin:kotlin-test:$kotlin_version"
-    testImplementation gradleTestKit()
-
-/*
-    // This is needed for test to get it on classpath and run
-    runtime "org.jetbrains.kotlin:kotlin-allopen:$kotlin_version"
-    runtime "org.jetbrains.kotlin:kotlin-compiler-embeddable:$kotlin_version"
-*/
 }
 
 // configuration of classpath for plugin integration tests