Build: pass -Xexpect-actual-classes to some libraries compile tasks

To suppress the warning introduced in KT-61573.

libraries/kotlin.test/annotations-common/build.gradle

@@ -10,7 +10,10 @@ dependencies {
 }
 
 tasks.withType(org.jetbrains.kotlin.gradle.dsl.KotlinCompile) {
-    kotlinOptions.freeCompilerArgs += "-Xallow-kotlin-package"
+    kotlinOptions.freeCompilerArgs += [
+        "-Xallow-kotlin-package",
+        "-Xexpect-actual-classes",
+    ]
 }
 
 jar {

libraries/kotlin.test/js-ir/build.gradle.kts

@@ -47,7 +47,8 @@ tasks.withType<KotlinCompile<*>>().configureEach {
     kotlinOptions.freeCompilerArgs += listOf(
         "-Xallow-kotlin-package",
         "-opt-in=kotlin.ExperimentalMultiplatform",
-        "-opt-in=kotlin.contracts.ExperimentalContracts"
+        "-opt-in=kotlin.contracts.ExperimentalContracts",
+        "-Xexpect-actual-classes"
     )
 }
 

libraries/kotlin.test/js/build.gradle

@@ -23,7 +23,8 @@ compileKotlin2Js {
             "-Xallow-kotlin-package",
             "-opt-in=kotlin.contracts.ExperimentalContracts",
             "-opt-in=kotlin.RequiresOptIn",
-            "-Xforce-deprecated-legacy-compiler-usage"
+            "-Xforce-deprecated-legacy-compiler-usage",
+            "-Xexpect-actual-classes"
     ]
     kotlinOptions {
         moduleKind = "umd"