Change apollo-angular imports to named non-namespace imports

**Is your feature request related to a problem? Please describe.**

Because of this https://github.com/thymikee/jest-preset-angular/issues/963 bug it is not possible to write tests with generated services.

**Describe the solution you'd like**

Imports for angular-apollo should be changed from `import * as Apollo from 'apollo-angular';` to `import {Apollo, ...} from 'apollo-angular'`

**Describe alternatives you've considered**

Hacky solutions described in the jest-preset-angular issue, that might have other unknown effects.