feat(SubscriptionOperation): only complete Queries and Mutations

[Frozen-byte]

Checklist:

• [x] If this PR is a new feature, please reference a discussion where a consensus about the design was reached (not necessary for small changes)
• [x] Make sure all the significant new logic is covered by tests

Fix for https://github.com/kamilkisiela/apollo-angular/issues/1563

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: f5b6552ee86100a1b613cabeda5f4d35b7ea4d06

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

| Name | Type | | -------------- | ----- | | apollo-angular | Major |

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[PowerKiKi]

LGTM. If you can rebase and squash all commits, then I'll merge

[Frozen-byte]

LGTM. If you can rebase and squash all commits, then I'll merge

sure, fpushed squashed changes as 96dadc5