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/diagnostics/tests/extensions/ExtensionFunctions.kt

@@ -9,7 +9,7 @@ fun <T: Any, E> T.foo(x : E, y : A) : T   {
   y plus 1
   y + 1.0
 
-  <!SAFE_CALL_WILL_CHANGE_NULLABILITY!>this<!UNNECESSARY_SAFE_CALL!>?.<!>minus<T>(this)<!>
+  this<!UNNECESSARY_SAFE_CALL!>?.<!>minus<T>(this)
 
   return this
 }
@@ -69,7 +69,7 @@ import outer.*
             command?.equals1(null)
 
             val c = Command()
-            <!SAFE_CALL_WILL_CHANGE_NULLABILITY!>c<!UNNECESSARY_SAFE_CALL!>?.<!>equals2(null)<!>
+            c<!UNNECESSARY_SAFE_CALL!>?.<!>equals2(null)
 
             if (command == null) 1
         }