GraphQL: Add CI jobs statistics types
What does this MR do and why?
Describe in detail what your merge request does and why.
This MR adds a couple of GraphQL types which will be used in #377963 (closed) to expose job queuing statistics.
Implementation overview
To avoid a huge MR at the end, I'm breaking up the work into several MRs to make reviews easier for everyone. The work is divided as follows:
The test coverage for the 2 types added here will be added in an upcoming MR (!107694 (merged)) that leverages them.
Part of #377963 (closed)
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