Add new metadata flag for class files compiled with FIR

Report a separate error when class files compiled with FIR are in
dependencies, in addition to the one for class files compiled with FE
1.0 + JVM IR.

 #KT-43592

core/descriptors.jvm/src/org/jetbrains/kotlin/load/kotlin/DeserializedDescriptorResolver.kt

@@ -101,6 +101,7 @@ class DeserializedDescriptorResolver {
     private val KotlinJvmBinaryClass.abiStability: DeserializedContainerAbiStability
         get() = when {
             components.configuration.allowUnstableDependencies -> DeserializedContainerAbiStability.STABLE
+            classHeader.isUnstableFirBinary -> DeserializedContainerAbiStability.FIR_UNSTABLE
             classHeader.isUnstableJvmIrBinary -> DeserializedContainerAbiStability.IR_UNSTABLE
             else -> DeserializedContainerAbiStability.STABLE
         }