[FIR] KT-44939: report REDUNDANT_VISIBILITY for explicit public overriding public

compiler/fir/analysis-tests/testData/resolve/extendedCheckers/RedundantVisibilityDueToOverride.kt

@@ -0,0 +1,18 @@
+abstract class A {
+    open var attribute = "a"
+        protected set
+}
+
+class C1 : A() {
+    <!REDUNDANT_VISIBILITY_MODIFIER!>public<!> override var attribute = super.attribute
+        public set
+}
+
+abstract class B2 : A() {
+    override var attribute = "b"
+        public set
+}
+
+class C2 : B2() {
+    <!REDUNDANT_VISIBILITY_MODIFIER!>public<!> override var attribute = super.attribute
+}