Ensure that the subscription table endpoints are all working properly in swatch-contracts.

/v1/subscriptions/products/{product_id}
/v2/subscriptions/products/{product_id}

IQE tests for reference: https://gitlab.cee.redhat.com/insights-qe/iqe-rhsm-subscriptions-plugin/-/blob/master/iqe_rhsm_subscriptions/conf/rhsm_subscriptions.default.yaml?ref_type=heads#L246

Done Criteria

• subscription table in swatch-contracts are able to be hit directly
• Existing swatch-api endpoints are not changed
• tests exist for that check subscription table endpoints directly via swatch contracts without going through swatch-api