PIN-7280 - APIV2 GET /producerKeychains and GET /producerKeychains/{keychainId}

[Carminepo2]

Merge after #2191
Closes PIN-7280
Closes PIN-7330

SRS

Description

Implemented GET /producerKeychains and GET /producerKeychains/{keychainId} routes in m2m gateway

Implementation

• Finalize SRS
• JIRA task link in PR, with link to SRS
• API spec of the route in m2mGatewayApi.yml
• Documentation: description fields in the spec endpoint, response, errors, params, etc.

Double-check errors

• Check errors returned by the process API calls (messages should be meaningful, clean, in correct English, etc.)
• Check spec errors: it should list all non-500 errors, also the ones that pass through from the process

Testing

Checklist:

• Bruno call added to collection
• Smoke test Bruno (attach result screenshot)
• [] Supertest /api tests
• /integration tests for the logic in the service