Rename: Do not report shadowing conflict if redeclaration is detected

#KT-13240 Fixed

idea/testData/refactoring/rename/noShadowingConflictForSiblingDeclarations/before/test.kt

@@ -0,0 +1,9 @@
+package test
+
+class /*rename*/SameScopeA { val contentA = 1 }
+class SameScopeB { val contentB = 2 }
+
+fun useClass() {
+    val va = SameScopeA().contentA
+    val vb = SameScopeB().contentB
+}

idea/testData/refactoring/rename/noShadowingConflictForSiblingDeclarations/noShadowingConflictForSiblingDeclarations.test

@@ -0,0 +1,7 @@
+{
+  "type": "MARKED_ELEMENT",
+  "mainFile": "test.kt",
+  "newName": "SameScopeB",
+  "withRuntime": "true",
+  "hint": "Class 'SameScopeB' is already declared in package 'test'"
+}