Add a Test System for Development

[klondikemarlen]

Context

Testing vastly speeds up development time, and makes it easy to avoid regressions. Currently the app does not have an associated test suite.

Test suite for:

• api
• web - might defer to a future ticket, definitely will be a second PR.

Requires:

• https://github.com/thoughtbot/fishery
• https://github.com/faker-js/faker.

Tests for api service should have an example of most types of tests:

• test that hits a given endpoint, peforms a full set of CRUD operations, and checks that the database is updated appropriately.
• tests for api/src/utils/formatter.ts
• test for api/src/models/funding-submission-line-json.ts
• tests for api/src/services/centre-services.ts
• tests for api/src/routes/user-router.ts
• tests for api/src/middleware/authorization.ts

Tests for web service should have an example of most types of tests:

• TODO but probably a component test and a store test, maybe a test of a plugin.

[klondikemarlen]

Web tests issue created at https://yg-hpw.atlassian.net/browse/ELCC-13