This is a follow-up from SWATCH-3625

Update the tests:

• test_subscription_table_api_subscription_type_contracts
• test_subscription_table_api_subscription_type_contracts_v2
• test_get_rhm_usage_context (it was deleted as part of another JIRA ticket)

to use the wiremock for subscription api

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/