Switch kotlin version to 1.7

* Change 1.6 to 1.7 constants
* Fix SAFE_CALL_WILL_CHANGE_NULLABILITY for testData
* Change EXPOSED_PROPERTY_TYPE_IN_CONSTRUCTOR_WARNING to EXPOSED_PROPERTY_TYPE_IN_CONSTRUCTOR_ERROR
* Change NON_EXHAUSTIVE_WHEN_STATEMENT to NO_ELSE_IN_WHEN
* Fix testData for SafeCallsAreAlwaysNullable
* Change T -> T & Any in test dumps
* Change INVALID_CHARACTERS_NATIVE_WARNING -> INVALID_CHARACTERS_NATIVE_ERROR
* TYPECHECKER_HAS_RUN_INTO_RECURSIVE_PROBLEM_WARNING -> TYPECHECKER_HAS_RUN_INTO_RECURSIVE_PROBLEM_ERROR

compiler/testData/codegen/bytecodeText/whenEnumOptimization/manyWhensWithinClass.kt

@@ -13,9 +13,8 @@ class A {
             Season.WINTER, Season.SPRING -> return "winter_spring"
             Season.SPRING -> return "spring"
             Season.SUMMER -> return "summer"
+            else -> return "autumn"
         }
-
-        return "autumn";
     }
 
     public fun bar2(y : Season) : String {