FE: force flexibility on unannotated ?

TODO: unify this code with FIR

 #KT-48515 Fixed

compiler/testData/diagnostics/foreignAnnotationsTests/java8Tests/jspecify/warnMode/UnannotatedWildcard.kt

@@ -0,0 +1,17 @@
+// FIR_IDENTICAL
+// JSPECIFY_STATE: warn
+// FILE: J1.java
+import org.jspecify.nullness.*;
+
+@NullMarked
+public interface J1<T extends @Nullable Object> {
+    T foo();
+}
+
+// FILE: J2.java
+public interface J2 {
+    J1<?> bar();
+}
+
+// FILE: main.kt
+fun baz(j2: J2): Any = j2.bar().foo() // Any..Any?

compiler/testData/diagnostics/foreignAnnotationsTests/java8Tests/jspecify/warnMode/UnannotatedWildcard.txt

@@ -0,0 +1,17 @@
+package
+
+public fun baz(/*0*/ j2: J2): kotlin.Any
+
+@org.jspecify.nullness.NullMarked public interface J1</*0*/ T : @org.jspecify.nullness.Nullable kotlin.Any!> {
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public abstract fun foo(): T!
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public interface J2 {
+    public abstract fun bar(): J1<out @org.jspecify.nullness.Nullable kotlin.Any!>!
+    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
+}