Handle LV 2.0 in modularized tests

compiler/fir/modularized-tests/tests/org/jetbrains/kotlin/fir/FE1FullPipelineModularizedTest.kt

@@ -11,7 +11,7 @@ class FE1FullPipelineModularizedTest : AbstractFullPipelineModularizedTest() {
     override fun configureArguments(args: K2JVMCompilerArguments, moduleData: ModuleData) {
         args.useK2 = false
         args.jvmDefault = "compatibility"
-        args.apiVersion = "1.4"
+        args.apiVersion = LANGUAGE_VERSION
         args.optIn = arrayOf(
             "kotlin.RequiresOptIn",
             "kotlin.contracts.ExperimentalContracts",

compiler/fir/modularized-tests/tests/org/jetbrains/kotlin/fir/FullPipelineModularizedTest.kt

@@ -7,13 +7,14 @@ package org.jetbrains.kotlin.fir
 
 import org.jetbrains.kotlin.cli.common.arguments.K2JVMCompilerArguments
 
-private val LANGUAGE_VERSION: String = System.getProperty("fir.bench.language.version", "1.4")
+internal val LANGUAGE_VERSION: String = System.getProperty("fir.bench.language.version", "1.4")
 
 class FullPipelineModularizedTest : AbstractFullPipelineModularizedTest() {
 
     override fun configureArguments(args: K2JVMCompilerArguments, moduleData: ModuleData) {
         args.useK2 = true
         args.useIR = true
+        args.languageVersion = "2.0"
         args.apiVersion = LANGUAGE_VERSION
         args.jvmDefault = "compatibility"
         args.optIn = moduleData.optInAnnotations.toTypedArray() + arrayOf(