GraphQL API: Add associatedProjects field to CiRunner

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Description

In #349452 (closed) we added a projects field to CiRunner in our GraphQL API to fetch the projects that a runner is assigned to.

We have since segregated the project owns the runner (ownerProject), as this project cannot be modified. We implemented this into our runner mutations in RunnerUpdateInput but haven't done so in our CiRunner type.

Currently we have:

CiRunner	RunnerUpdateInput
projects	ownerProject & associatedProjects

We aim to have

CiRunner	RunnerUpdateInput
projects, ownerProject & associatedProjects	ownerProject & associatedProjects

We described this here:

If down the line we see that an associatedProjects (i.e. projects minus ownerProject) is much more useful than a projects field, we can (...) add associatedProjects and deprecate projects (...).

Possible deprecations

• projects may be deprecated here, as the separate owner and associated fields provides the same information.