Move CollectionJob mutations into CollectionJobOperations where appropriate

[stalgiag]

This PR moves all of the mutation resolvers that are contextual to an existing CollectionJob into CollectionJobOperations.

These are :

• deleteCollectionJob
• restartCollectionJob
• updateCollectionJob

These changes make are intended to make the GraphQL interface for CollectionJobs more organized and clear.

[alflennik]

@stalgiag are you ready for the team to review? If so go ahead and assign someone?

[stalgiag]

@stalgiag are you ready for the team to review? If so go ahead and assign someone?

Thanks for checking in. I've intentionally let this sit on the vine as this was a lower priority and I thought it better to let #943 land first since it would likely necessitate some changes in this one.

[stalgiag]

Closing as this small debt task coincided with some larger changes and the conflicts are so substantial that this task should be started over.