Put separate tag to KotlinTestK2LibraryTest to disable it for one-stage testing

Merge-request: KT-MR-9054
Merged-by: Vladimir Sukharev <Vladimir.Sukharev@jetbrains.com>

native/native.tests/tests/org/jetbrains/kotlin/konan/blackboxtest/KotlinTestLibraryTest.kt

@@ -36,7 +36,7 @@ class KotlinTestLibraryTest : AbstractNativeBlackBoxTest() {
     fun worker() = dynamicTestCase(TestCaseId.Named("worker"))
 }
 
-@Tag("kotlin-test")
+@Tag("kotlin-testK2")
 @PredefinedTestCases(
     TC(
         name = "default",