Move jvm toolchain tests under jvm platform test tag.

^KT-45745 In Progress

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

@@ -18,7 +18,7 @@ import kotlin.io.path.createDirectories
 import kotlin.io.path.writeText
 
 @DisplayName("JVM tasks target validation")
-@SimpleGradlePluginTests
+@JvmGradlePluginTests
 class JvmTargetValidationTest : KGPBaseTest() {
 
     @DisplayName("Should produce warning if java and kotlin jvm targets are different")

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

@@ -15,7 +15,7 @@ import org.jetbrains.kotlin.gradle.testbase.*
 import org.junit.jupiter.api.DisplayName
 import java.io.File
 
-@SimpleGradlePluginTests
+@JvmGradlePluginTests
 @DisplayName("Kotlin Java Toolchain support")
 class KotlinJavaToolchainTest : KGPBaseTest() {