Put proper tag to stdlibK2

Merge-request: KT-MR-9034
Merged-by: Vladimir Sukharev <Vladimir.Sukharev@jetbrains.com>

native/native.tests/build.gradle.kts

@@ -46,6 +46,7 @@ val infrastructureTest = nativeTest("infrastructureTest", "infrastructure")
 val codegenBoxTest = nativeTest("codegenBoxTest", "codegen")
 val codegenK2BoxTest = nativeTest("codegenK2BoxTest", "codegenK2")
 val stdlibTest = nativeTest("stdlibTest", "stdlib")
+val stdlibK2Test = nativeTest("stdlibTest", "stdlibK2")
 val kotlinTestLibraryTest = nativeTest("kotlinTestLibraryTest", "kotlin-test")
 val klibAbiTest = nativeTest("klibAbiTest", "klib-abi")
 val klibBinaryCompatibilityTest = nativeTest("klibBinaryCompatibilityTest", "klib-binary-compatibility")

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

@@ -53,7 +53,7 @@ class StdlibTest : AbstractNativeBlackBoxTest() {
     fun worker() = dynamicTestCase(TestCaseId.Named("worker"))
 }
 
-@Tag("stdlib")
+@Tag("stdlibK2")
 @PredefinedTestCases(
     TC(
         name = "default",