[FIR] Don't report EXPOSED_FUNCTION_RETURN_TYPE on property accessors

compiler/testData/diagnostics/tests/visibility/protectedInternal.kt

@@ -0,0 +1,13 @@
+// FIR_IDENTICAL
+abstract class A
+
+internal class B : A()
+
+abstract class Base {
+    protected abstract val a: A
+}
+
+internal class Derived : Base() {
+    override val a = B()
+        get() = field
+}

compiler/testData/diagnostics/tests/visibility/protectedInternal.txt

@@ -0,0 +1,31 @@
+package
+
+public abstract class A {
+    public constructor A()
+    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
+}
+
+internal final class B : A {
+    public constructor B()
+    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 abstract class Base {
+    public constructor Base()
+    protected abstract val a: A
+    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
+}
+
+internal final class Derived : Base {
+    public constructor Derived()
+    protected open override /*1*/ val a: B
+    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
+}