[Multi-Tenant] Fix feature branch tests for Open Payments Resources

[njlie]

A lot of tests were broken by the fact that several existing tables have added foreign key constraints on tenantId, fix the tests for the models/services/routes for the Open Payments resources:

• Fix tests on Incoming Payments (/backend/src/open_payments/payment/incoming)
• Fix tests on Remote Incoming Payments (/backend/src/open_payments/payment/incoming_remote)
• Fix tests on Quotes (/backend/src/open_payments/quote)
• Fix tests on Outgoing Payments (/backend/src/open_payments/payment/outgoing)
• Fix tests on Wallet Addresses (/backend/src/open_payments/wallet_address)
• Fix tests on Combined Payments (/backend/src/open_payments/payment/combined)

[njlie]

Closing as current multi-tenancy feature branch implements deprecated design.