[explorer] Create Test Suite for Transaction Results

[stella3d]

We need some example transactions for the explorer front-end to be developed with.

Get the data from these DBMaps in authority stores:
effects: DBMap<TransactionDigest, TransactionEffectsEnvelope<S>>
and
certificates: DBMap<TransactionDigest, CertifiedTransaction>

[todd-mystenlabs]

@stella3d, @Jibz1 - is this one done?

[stella3d]

we have real data now, so the existing mock data needs to be updated

[apburnie]

The Transactions Results are now connected to live data, which removes the short-term need that mock transaction data was required in creating the UI. There is still a need for mock transaction dataset which, as with addresses and objects, would be useful in supporting a testing suite for the Transaction Results UI. This issue has hence been broadened to cover the creation of a test suite for the Transaction Results.