Enhance tests by use of test containers and playwright.

[peterMuriuki]

Express server has 2 main external service integrations:

• a keycloak service
• an optional redis service.

This makes it particular involving to write tests for functionality that lean more towards integration of these services .e.g testing endpoints that require authentication. We currently try to make use of mocks but this too can get elaborate and easily break when we update underlying libraries.

I propose looking into how we can use testcontainers to provision the above 2 mentioned services as ephemeral containers. we can then use playwright to orchestrate tests that might require user action like logging in via a web platform.