Don't import test code

[wilsonianb]

The local playground currently has the following:

local-backend-1       | /workspace/packages/backend/dist/shared/routes.test.js:62
local-backend-1       | test.todo('test suite must contain at least one test');
local-backend-1       | ^
local-backend-1       | 
local-backend-1       | ReferenceError: test is not defined
local-backend-1       |     at Object.<anonymous> (/workspace/packages/backend/dist/shared/routes.test.js:62:1)
local-backend-1       |     at Module._compile (node:internal/modules/cjs/loader:1126:14)
local-backend-1       |     at Object.Module._extensions..js (node:internal/modules/cjs/loader:1180:10)
local-backend-1       |     at Module.load (node:internal/modules/cjs/loader:1004:32)
local-backend-1       |     at Function.Module._load (node:internal/modules/cjs/loader:839:12)
local-backend-1       |     at Module.require (node:internal/modules/cjs/loader:1028:19)
local-backend-1       |     at require (node:internal/modules/cjs/helpers:102:18)
local-backend-1       |     at Object.<anonymous> (/workspace/packages/backend/dist/open_payments/client/service.js:15:23)
local-backend-1       |     at Module._compile (node:internal/modules/cjs/loader:1126:14)
local-backend-1       |     at Object.Module._extensions..js (node:internal/modules/cjs/loader:1180:10)
local-peer-backend-1  | /workspace/packages/backend/dist/shared/routes.test.js:62
local-peer-backend-1  | test.todo('test suite must contain at least one test');
local-peer-backend-1  | ^
local-peer-backend-1  | 
local-peer-backend-1  | ReferenceError: test is not defined
local-peer-backend-1  |     at Object.<anonymous> (/workspace/packages/backend/dist/shared/routes.test.js:62:1)
local-peer-backend-1  |     at Module._compile (node:internal/modules/cjs/loader:1126:14)
local-peer-backend-1  |     at Object.Module._extensions..js (node:internal/modules/cjs/loader:1180:10)
local-peer-backend-1  |     at Module.load (node:internal/modules/cjs/loader:1004:32)
local-peer-backend-1  |     at Function.Module._load (node:internal/modules/cjs/loader:839:12)
local-peer-backend-1  |     at Module.require (node:internal/modules/cjs/loader:1028:19)
local-peer-backend-1  |     at require (node:internal/modules/cjs/helpers:102:18)
local-peer-backend-1  |     at Object.<anonymous> (/workspace/packages/backend/dist/open_payments/client/service.js:15:23)
local-peer-backend-1  |     at Module._compile (node:internal/modules/cjs/loader:1126:14)
local-peer-backend-1  |     at Object.Module._extensions..js (node:internal/modules/cjs/loader:1180:10)
local-backend-1 exited with code 1

This is due to the following import(s) in non-test code:

rafiki/packages/backend/src/open_payments/client/service.ts

Lines 16 to 19 in fd658a0

	// TODO: move out of *.tests
	import { setup } from '../../shared/routes.test'
	// TODO: move out of /tests
	import { createContext } from '../../tests/context'