[K/N][tests] Drop obsolete test tags

The obsolete tags that are no more used and are dropped by this commit:
* 'stdlibK2'
* 'kotlin-testK2'
* 'codegenK2'
* 'k2libContents'
* 'firInfrastructure'

native/native.tests/tests-gen/org/jetbrains/kotlin/konan/blackboxtest/FirInfrastructureTestGenerated.java

@@ -24,7 +24,6 @@ public class FirInfrastructureTestGenerated extends AbstractNativeBlackBoxTest {
     @TestMetadata("native/native.tests/testData/samples")
     @TestDataPath("$PROJECT_ROOT")
     @Tag("infrastructure")
-    @Tag("firInfrastructure")
     @Tag("frontend-fir")
     @FirPipeline()
     @UseStandardTestCaseGroupProvider()
@@ -248,7 +247,6 @@ public class FirInfrastructureTestGenerated extends AbstractNativeBlackBoxTest {
         @TestMetadata("native/native.tests/testData/samples/inner")
         @TestDataPath("$PROJECT_ROOT")
         @Tag("infrastructure")
-        @Tag("firInfrastructure")
         @Tag("frontend-fir")
         @FirPipeline()
         @UseStandardTestCaseGroupProvider()
@@ -270,7 +268,6 @@ public class FirInfrastructureTestGenerated extends AbstractNativeBlackBoxTest {
     @TestMetadata("native/native.tests/testData/samples2")
     @TestDataPath("$PROJECT_ROOT")
     @Tag("infrastructure")
-    @Tag("firInfrastructure")
     @Tag("frontend-fir")
     @FirPipeline()
     @UseStandardTestCaseGroupProvider()

native/native.tests/tests-gen/org/jetbrains/kotlin/konan/blackboxtest/FirNativeKLibContentsTestGenerated.java

@@ -20,7 +20,6 @@ import java.util.regex.Pattern;
 @SuppressWarnings("all")
 @TestMetadata("native/native.tests/testData/klibContents")
 @TestDataPath("$PROJECT_ROOT")
-@Tag("k2libContents")
 @Tag("frontend-fir")
 @FirPipeline()
 public class FirNativeKLibContentsTestGenerated extends AbstractNativeKlibContentsTest {
@@ -68,7 +67,6 @@ public class FirNativeKLibContentsTestGenerated extends AbstractNativeKlibConten
     @Nested
     @TestMetadata("native/native.tests/testData/klibContents/builtinsSerializer")
     @TestDataPath("$PROJECT_ROOT")
-    @Tag("k2libContents")
     @Tag("frontend-fir")
     @FirPipeline()
     public class BuiltinsSerializer {
@@ -140,7 +138,6 @@ public class FirNativeKLibContentsTestGenerated extends AbstractNativeKlibConten
         @Nested
         @TestMetadata("native/native.tests/testData/klibContents/builtinsSerializer/annotationArguments")
         @TestDataPath("$PROJECT_ROOT")
-        @Tag("k2libContents")
         @Tag("frontend-fir")
         @FirPipeline()
         public class AnnotationArguments {
@@ -190,7 +187,6 @@ public class FirNativeKLibContentsTestGenerated extends AbstractNativeKlibConten
     @Nested
     @TestMetadata("native/native.tests/testData/klibContents/klib")
     @TestDataPath("$PROJECT_ROOT")
-    @Tag("k2libContents")
     @Tag("frontend-fir")
     @FirPipeline()
     public class Klib {

native/native.tests/tests/org/jetbrains/kotlin/generators/tests/GenerateNativeTests.kt

@@ -53,7 +53,6 @@ fun main() {
             testClass<AbstractNativeCodegenBoxTest>(
                 suiteTestClassName = "FirNativeCodegenBoxTestGenerated",
                 annotations = listOf(
-                    deprecated_codegenK2(),
                     *frontendFir(),
                     provider<UseExtTestCaseGroupProvider>()
                 )
@@ -64,7 +63,6 @@ fun main() {
             testClass<AbstractNativeCodegenBoxTest>(
                 suiteTestClassName = "FirNativeCodegenBoxTestNoPLGenerated",
                 annotations = listOf(
-                    deprecated_codegenK2(),
                     *frontendFir(),
                     provider<UseExtTestCaseGroupProvider>(),
                     *noPartialLinkage()
@@ -94,7 +92,6 @@ fun main() {
                 suiteTestClassName = "FirInfrastructureTestGenerated",
                 annotations = listOf(
                     infrastructure(),
-                    deprecated_firInfrastructure(),
                     *frontendFir(),
                     provider<UseStandardTestCaseGroupProvider>()
                 )
@@ -180,7 +177,6 @@ fun main() {
             testClass<AbstractNativeKlibContentsTest>(
                 suiteTestClassName = "FirNativeKLibContentsTestGenerated",
                 annotations = listOf(
-                    deprecated_k2libContents(),
                     *frontendFir()
                 )
             ) {
@@ -241,8 +237,3 @@ private fun frontendFir() = arrayOf(
 
 private fun debugger() = annotation(Tag::class.java, "debugger")
 private fun infrastructure() = annotation(Tag::class.java, "infrastructure")
-
-// TODO: To be removed.
-private fun deprecated_codegenK2() = annotation(Tag::class.java, "codegenK2")
-private fun deprecated_k2libContents() = annotation(Tag::class.java, "k2libContents")
-private fun deprecated_firInfrastructure() = annotation(Tag::class.java, "firInfrastructure")

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

@@ -39,7 +39,6 @@ class KotlinTestLibraryTest : AbstractNativeBlackBoxTest() {
 }
 
 @Tag("kotlin-test")
-@Tag("kotlin-testK2") // TODO: To be removed.
 @Tag("frontend-fir")
 @PredefinedTestCases(
     TC(

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

@@ -56,7 +56,6 @@ class StdlibTest : AbstractNativeBlackBoxTest() {
 }
 
 @Tag("stdlib")
-@Tag("stdlibK2") // TODO: To be removed.
 @Tag("frontend-fir")
 @PredefinedTestCases(
     TC(