[NI] Improve CST algorithm to handle non-fixed variables

#KT-32456 Fixed
 #KT-32423 Fixed
 #KT-32818 Fixed
 #KT-33197 Fixed

core/descriptors/src/org/jetbrains/kotlin/types/checker/ClassicTypeCheckerContext.kt

@@ -25,6 +25,7 @@ import org.jetbrains.kotlin.types.refinement.TypeRefinement
 
 open class ClassicTypeCheckerContext(
     val errorTypeEqualsToAnything: Boolean,
+    val stubTypeEqualsToAnything: Boolean = true,
     val allowedTypeVariable: Boolean = true,
     val kotlinTypeRefiner: KotlinTypeRefiner = KotlinTypeRefiner.Default
 ) : ClassicTypeSystemContext, AbstractTypeCheckerContext() {
@@ -43,6 +44,9 @@ open class ClassicTypeCheckerContext(
     override val isErrorTypeEqualsToAnything: Boolean
         get() = errorTypeEqualsToAnything
 
+    override val isStubTypeEqualsToAnything: Boolean
+        get() = stubTypeEqualsToAnything
+
     override fun areEqualTypeConstructors(a: TypeConstructorMarker, b: TypeConstructorMarker): Boolean {
         require(a is TypeConstructor, a::errorMessage)
         require(b is TypeConstructor, b::errorMessage)

core/descriptors/src/org/jetbrains/kotlin/types/checker/ClassicTypeSystemContext.kt

@@ -321,8 +321,11 @@ interface ClassicTypeSystemContext : TypeSystemInferenceExtensionContext, TypeSy
     }
 
 
-    override fun newBaseTypeCheckerContext(errorTypesEqualToAnything: Boolean): AbstractTypeCheckerContext {
-        return ClassicTypeCheckerContext(errorTypesEqualToAnything)
+    override fun newBaseTypeCheckerContext(
+        errorTypesEqualToAnything: Boolean,
+        stubTypesEqualToAnything: Boolean
+    ): AbstractTypeCheckerContext {
+        return ClassicTypeCheckerContext(errorTypesEqualToAnything, stubTypesEqualToAnything)
     }
 
     override fun nullableNothingType(): SimpleTypeMarker {

core/descriptors/src/org/jetbrains/kotlin/types/checker/NewKotlinTypeChecker.kt

@@ -148,7 +148,7 @@ object NullabilityChecker {
 
     fun isSubtypeOfAny(type: UnwrappedType): Boolean =
         SimpleClassicTypeSystemContext
-            .newBaseTypeCheckerContext(false)
+            .newBaseTypeCheckerContext(errorTypesEqualToAnything = false, stubTypesEqualToAnything = true)
             .hasNotNullSupertype(type.lowerIfFlexible(), SupertypesPolicy.LowerIfFlexible)
 }