Rename: DeserializedContainerAbiStability.IR_UNSTABLE -> UNSTABLE

Related to KT-62056

core/compiler.common/src/org/jetbrains/kotlin/serialization/deserialization/descriptors/DeserializedContainerSource.kt

@@ -32,5 +32,5 @@ enum class DeserializedContainerAbiStability {
     // 2) it is compiled with JVM IR >= 1.4.30 with the `-Xabi-stability=unstable` compiler option,
     // 3) it is compiled with FIR prior to 2.0.0,
     // and this compiler is _not_ configured to ignore that.
-    IR_UNSTABLE,
+    UNSTABLE,
 }

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

@@ -112,7 +112,7 @@ class DeserializedDescriptorResolver {
     private val KotlinJvmBinaryClass.abiStability: DeserializedContainerAbiStability
         get() = when {
             components.configuration.allowUnstableDependencies -> DeserializedContainerAbiStability.STABLE
-            classHeader.isUnstableJvmIrBinary -> DeserializedContainerAbiStability.IR_UNSTABLE
+            classHeader.isUnstableJvmIrBinary -> DeserializedContainerAbiStability.UNSTABLE
             else -> DeserializedContainerAbiStability.STABLE
         }