Don't report EXPERIMENTAL_OVERRIDE_ERROR on annotated local functions

#KT-31728 Fixed

compiler/testData/diagnostics/testsWithStdLib/experimental/overrideInAnonymousObject.kt

@@ -0,0 +1,23 @@
+// FIR_IDENTICAL
+// !USE_EXPERIMENTAL: kotlin.RequiresOptIn
+
+@RequiresOptIn
+@Retention(AnnotationRetention.BINARY)
+@Target(AnnotationTarget.CLASS, AnnotationTarget.FUNCTION)
+annotation class MyAnn
+
+interface MyInterface {
+    @MyAnn
+    fun foo()
+
+    @MyAnn
+    fun bar()
+}
+
+val field = object : MyInterface {
+    @MyAnn
+    override fun foo() {}
+
+    @OptIn(MyAnn::class)
+    override fun bar() {}
+}

compiler/testData/diagnostics/testsWithStdLib/experimental/overrideInAnonymousObject.txt

@@ -0,0 +1,18 @@
+package
+
+public val field: MyInterface
+
+@kotlin.RequiresOptIn @kotlin.annotation.Retention(value = AnnotationRetention.BINARY) @kotlin.annotation.Target(allowedTargets = {AnnotationTarget.CLASS, AnnotationTarget.FUNCTION}) public final annotation class MyAnn : kotlin.Annotation {
+    public constructor MyAnn()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public interface MyInterface {
+    @MyAnn public abstract fun bar(): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    @MyAnn public abstract fun foo(): kotlin.Unit
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}