[ForestRun] Address flaky tests in Apollo test suite

Builds are failing randomly due to flaky tests in Apollo compatibility test suite. We should collect a complete list of flaky tests here and fix them eventually.

**@graphitation/apollo-forest-run test**

- [ ] src/__tests__/subscribeToMore.ts
- [ ] react/components/__tests__/client/Query.test.tsx: Query component › should support mixing setState and onCompleted