Swatch does not update the subscription.productIds when that's the only thing that changes on a subscription

Notably see that org.candlepin.subscriptions.db.model.Subscription#equals does not consider productIds.

One effect of this, is that when we configured SAP support, many of the SAP subscriptions didn't get updated with the rhel-for-sap-x86 product ID.

Prior to onboarding SAP, those subscriptions were synced with a set of product ids not including rhel-for-sap-x86, and after configuration, they should be updated, but they are not.