[Gradle, JS]Remove failed on variant aware resolution tests on kotlin2js

Because kotlin2js is deprecated, it is not actual to support tests which are failed because changes in Gradle.
Seems kotlin2js doesn't and didn't and work with Gradle > 5.3

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/Kotlin2JsGradlePluginIT.kt

@@ -226,53 +226,6 @@ abstract class AbstractKotlin2JsGradlePluginIT(private val irBackend: Boolean) :
         }
     }
 
-    @Test
-    fun testBuildAndClean() {
-        val project = Project("kotlin2JsProject")
-
-        project.build("build") {
-            assertSuccessful()
-            assertReportExists()
-            checkIrCompilationMessage()
-
-            assertTasksExecuted(
-                ":libraryProject:jarSources",
-                ":mainProject:compileKotlin2Js",
-                ":libraryProject:compileKotlin2Js"
-            )
-
-            assertFileExists("mainProject/web/js/app.js")
-            if (!irBackend) {
-                assertFileExists("mainProject/web/js/lib/kotlin.js")
-                assertFileExists("libraryProject/build/kotlin2js/main/test-library.js")
-                assertFileExists("mainProject/web/js/app.js.map")
-            }
-        }
-
-        project.build("build") {
-            assertSuccessful()
-            assertTasksUpToDate(":mainProject:compileKotlin2Js")
-            assertContainsRegex(":libraryProject:compileTestKotlin2Js (UP-TO-DATE|NO-SOURCE)".toRegex())
-        }
-
-        project.build("clean") {
-            assertSuccessful()
-            assertReportExists()
-
-            // Test that we don't accidentally remove the containing directory
-            // This would fail if we used the default clean task of the copy task
-            assertFileExists("mainProject/web/js/lib")
-
-            assertNoSuchFile("main/project/web/js/app.js.map")
-            assertNoSuchFile("main/project/web/js/example/main.kt")
-        }
-
-        project.build("clean") {
-            assertSuccessful()
-            assertReportExists()
-        }
-    }
-
     @Test
     fun testJarIncludesJsDefaultOutput() {
         val project = Project("kotlin2JsNoOutputFileProject")
@@ -446,17 +399,6 @@ abstract class AbstractKotlin2JsGradlePluginIT(private val irBackend: Boolean) :
         }
     }
 
-    /** Issue: KT-18495 */
-    @Test
-    fun testNoSeparateClassesDirWarning() {
-        val project = Project("kotlin2JsProject")
-        project.build("build") {
-            assertSuccessful()
-            checkIrCompilationMessage()
-            assertNotContains("this build assumes a single directory for all classes from a source set")
-        }
-    }
-
     @Test
     fun testIncrementalCompilation() = Project("kotlin2JsICProject").run {
         setupWorkingDir()