Should we refactor to have Ruby objects for project services ?

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See https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/29836/diffs#a3f67a50429ca8dc26ec18ff2e50680d7e26c7fc - we are passing around hashes when we can pass more structured objects

The following discussion from gitlab-ce!29836 should be addressed:

• @tkuah started a discussion:

  General observation: Not sure why we won't create actual Ruby objects from these hashes ?

  This is way beyond the scope of this MR - I just wanted to note this somewhere