Pricing validations removed from all API versions

In our 2020-04 API version, we added validation requiring the compare_at_price field to always be greater than the price field on variants.

After further review of use cases around the current use of the compare_at_price field, we're reverting the addition of validation between the price and compare_at_price fields on variants, and notifications about this change as we will be removed from all versions.

If you're currently seeing notifications about this change in your API Health dashboard, you can safely ignore them. If you've already updated your app to handle this breaking change, there's no need for action. Your app will continue to function throughout the revert.