Find Usages: Restrict search scope for private class members

#KT-6124 Fixed

idea/testData/findUsages/kotlin/findClassUsages/kotlinPrivateClassUsages.results.txt

@@ -1,3 +1 @@
 New instance creation (10: 33) open fun processRequest() = Foo()
-New instance creation (14: 44) override fun processRequest() = Server.Foo()
-New instance creation (5: 24) println(Server.Foo())

idea/testData/findUsages/kotlin/findFunctionUsages/kotlinPrivateMethodUsages.results.txt

@@ -1,3 +1 @@
-Function call (12: 45) override fun processRequest() = "foo" + doProcessRequest()
-Function call (5: 18) Server().doProcessRequest()
 Function call (8: 33) open fun processRequest() = doProcessRequest()

idea/testData/findUsages/kotlin/findObjectUsages/kotlinPrivateObjectUsages.results.txt

@@ -1,3 +1 @@
 Value read (10: 33) open fun processRequest() = Foo
-Value read (14: 44) override fun processRequest() = Server.Foo
-Value read (5: 26) println(Server().Foo)

idea/testData/findUsages/kotlin/findPropertyUsages/kotlinPrivatePropertyUsages.results.txt

@@ -1,3 +1 @@
-Value read (12: 45) override fun processRequest() = "foo" + foo
-Value read (5: 26) println(Server().foo)
 Value read (8: 33) open fun processRequest() = foo

idea/testData/findUsages/kotlin/findPropertyUsages/kotlinPrivatePropertyUsages2.results.txt

@@ -1,3 +1 @@
-Value read (10: 45) override fun processRequest() = "foo" + foo
-Value read (5: 26) println(Server().foo)
 Value read (6: 33) open fun processRequest() = foo