[foreignexchange] Code generation: update services and models - #2072

There is a logic bug in the discriminator resolution when the child schema has a different discriminator name. Calling getDiscriminatorValue(node) without a qualifier invokes the method on this (the parent), which re-evaluates the parent's discriminator instead of the child's. It should be childCdm.getDiscriminatorValue(node). Additionally, the null check if (childCdm != null) is redundant because childCdm == null is already checked and handled above.

        if (!discriminatorName.equals(childCdm.discriminatorName)) {
          discrValue = childCdm.getDiscriminatorValue(node);
          if (discrValue == null) {
            continue;
          }
        }
        // Recursively traverse the discriminator mappings.
        Class<?> childDiscr = childCdm.getClassForElement(node, visitedClasses);
        if (childDiscr != null) {
          return childDiscr;
        }

The equals method overrides Object.equals(Object) but is missing the @Override annotation. Adding @Override is a best practice to ensure compile-time safety and clarity.

  @Override
  public boolean equals(Object o) {