[NI] Discard DefNotNull types inside invariant positions

#KT-30297 Fixed
 #KT-32168 Fixed
 #KT-27722 Fixed (actually, it was fixed with addition of DefNotNullTypes, and now test was added to save this behavior)
 #KT-32345 Fixed

compiler/testData/diagnostics/testsWithStdLib/inference/kt27772.txt

@@ -0,0 +1,4 @@
+package
+
+public fun </*0*/ T : kotlin.Any> bar(/*0*/ resources: kotlin.collections.List<T>): kotlin.Unit
+public fun </*0*/ T> foo(/*0*/ resources: kotlin.collections.List<T>): kotlin.Unit