FirSupertypesChecker: implement six more diagnostics

compiler/fir/analysis-tests/testData/resolveWithStdlib/multiModule/MemberType.fir.txt

@@ -19,7 +19,7 @@ FILE: common.kt
     }
 Module: m1-jvm
 FILE: jvm.kt
-    public final actual class MyList : R|kotlin/Any| {
+    public open actual class MyList : R|kotlin/Any| {
         public constructor(): R|MyList| {
             super<R|kotlin/Any|>()
         }

compiler/fir/analysis-tests/testData/resolveWithStdlib/multiModule/MemberType.kt

@@ -11,7 +11,7 @@ open class Wrapper(val list: MyList)
 // MODULE: m1-jvm(m1-common)
 // FILE: jvm.kt
 
-actual class MyList {
+actual open class MyList {
     actual fun get(i: Int): Int = i
 
     fun set(i: Int, v: Int) {}