This is a follow-up from SWATCH-3625

Update the test setup to create a mock for the product in following tests:

• test_verify_contract_capacity
• test_rhel_unlimited_sku_capacity
• test_contracts_capacity_api_invalid_data (fixed with: SWATCH-3691)

The component tests should pass when run locally following the steps on https://inscope.corp.redhat.com/docs/default/Component/swatch-internal-docs/IQE/IQE%20local%20setup/

Acceptance Criteria: The following should pass:
iqe tests plugin rhsm_subscriptions -k test_verify_contract_capacity
iqe tests plugin rhsm_subscriptions -k test_rhel_unlimited_sku_capacity