refactor: rewrite useVersion and healthcheck with RQ

packages/backend/src/graphql/queries/healthcheck.js

@@ -1,9 +0,0 @@
-import appConfig from '../../config/app.js';
-
-const healthcheck = () => {
-  return {
-    version: appConfig.version,
-  };
-};
-
-export default healthcheck;

packages/backend/src/graphql/queries/healthcheck.test.js

@@ -1,27 +0,0 @@
-import { describe, it, expect } from 'vitest';
-import request from 'supertest';
-import app from '../../app';
-import appConfig from '../../config/app';
-
-describe('graphQL healthcheck query', () => {
-  it('should return application version', async () => {
-    const query = `
-      query {
-        healthcheck {
-          version
-        }
-      }
-    `;
-
-    const response = await request(app)
-      .post('/graphql')
-      .send({ query })
-      .expect(200);
-
-    const expectedResponsePayload = {
-      data: { healthcheck: { version: appConfig.version } },
-    };
-
-    expect(response.body).toEqual(expectedResponsePayload);
-  });
-});