[Parcelize] Align checker and generator on valid Parcelize classes

A previous fix to the generator made the generator and checker
validation of classes which could be parcelized different. The checker
would report error in cases where the generator would not generate
anything. Align these checks, with improved code sharing, so errors are
not reported on classes which will not have parcelize components
generated.

^KT-63086 Fixed

plugins/parcelize/parcelize-compiler/testData/diagnostics/modality.fir.kt

@@ -6,6 +6,8 @@ import android.os.Parcelable
 @Parcelize
 open class Open(val foo: String) : Parcelable
 
+data class Derived(val bar: String) : Open(bar)
+
 @Parcelize
 class Final(val foo: String) : Parcelable
 
@@ -29,6 +31,8 @@ fun foo() {
     @Parcelize
     <!ABSTRACT_MEMBER_NOT_IMPLEMENTED, PARCELABLE_SHOULD_BE_CLASS!>object<!> : Parcelable {}
 
+    object : Open("") {}
+
     @Parcelize
     class <!NO_PARCELABLE_SUPERTYPE, PARCELABLE_CANT_BE_LOCAL_CLASS!>Local<!> {}
 }

plugins/parcelize/parcelize-compiler/testData/diagnostics/modality.kt

@@ -6,6 +6,8 @@ import android.os.Parcelable
 @Parcelize
 open class Open(val foo: String) : Parcelable
 
+data class Derived(val bar: String) : Open(bar)
+
 @Parcelize
 class Final(val foo: String) : Parcelable
 
@@ -29,6 +31,8 @@ fun foo() {
     @Parcelize
     <!PARCELABLE_CANT_BE_LOCAL_CLASS!>object<!> : Parcelable {}
 
+    object : Open("") {}
+
     @Parcelize
     class <!NO_PARCELABLE_SUPERTYPE, PARCELABLE_CANT_BE_LOCAL_CLASS!>Local<!> {}
 }