FIR checker: report SUPERTYPE_NOT_INITIALIZED

Combined this and the checker of
SUPERTYPE_INITIALIZED_WITHOUT_PRIMARY_CONSTRUCTOR together.

Also fixed SUPERTYPE_INITIALIZED_WITHOUT_PRIMARY_CONSTRUCTOR incorrectly
repoted as warning instead of error.

compiler/testData/diagnostics/tests/multiplatform/headerClass/baseExpectClassWithoutConstructor.fir.kt

@@ -4,7 +4,7 @@
 
 expect open class A
 expect class B : A
-open class C : A
+open class C : <!SUPERTYPE_NOT_INITIALIZED!>A<!>
 
 // MODULE: m1-jvm(m1-common)
 // FILE: jvm.kt

compiler/testData/diagnostics/tests/multiplatform/sealedTypeAlias.kt

@@ -15,4 +15,4 @@ actual typealias Presence = P
 sealed class P {
     object Online : P()
     object Offline : P()
-}
+}