Fix false positive "Unused symbol" for type alias & private nested class/object

#KT-21526 Fixed
 #KT-30527 Fixed

idea/testData/quickfix/removeUnused/companionViaImport3.kt

@@ -0,0 +1,8 @@
+// "Safe delete 'NamedObject'" "true"
+import TestClass.NamedObject
+
+class TestClass{
+    private object NamedObject<caret> {
+        const val CONST = "abc"
+    }
+}

idea/testData/quickfix/removeUnused/companionViaImport3.kt.after

@@ -0,0 +1,4 @@
+// "Safe delete 'NamedObject'" "true"
+
+class TestClass{
+}

idea/testData/quickfix/removeUnused/typeAlias2.kt

@@ -0,0 +1,9 @@
+// "Safe delete 'Other'" "true"
+import Other
+
+enum class MyEnum {
+    HELLO,
+    WORLD
+}
+
+typealias Other<caret> = MyEnum

idea/testData/quickfix/removeUnused/typeAlias2.kt.after

@@ -0,0 +1,7 @@
+// "Safe delete 'Other'" "true"
+
+enum class MyEnum {
+    HELLO,
+    WORLD
+}
+