[graphql] Move system state summary into epoch

[stefan-mysten]

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Description

Moves the system state summary unique fields into the Epoch struct. If the latest system state epoch is the same as the requested one, we compute the system state summary as before. If the epoch requested is older, we need to fetch the system state summary from the other table; next to do on my list.

Waiting for #15434

Test Plan

How did you test the new or updated feature?

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Type of Change (Check all that apply)

• [ ] protocol change
• [ ] user-visible impact
• [ ] breaking change for a client SDKs
• [ ] breaking change for FNs (FN binary must upgrade)
• [ ] breaking change for validators or node operators (must upgrade binaries)
• [ ] breaking change for on-chain data layout
• [ ] necessitate either a data wipe or data migration

Release notes

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[stefan-mysten]

Closing this as there were too many conflicts and it was easier to start afresh. Superseded by #15489