Staging testnet subgraph phase 1

This release just updates the subgraph deployment ID, as it had the incorrect one published

This subgraph is used by the team for testing purposes. Find the npm package here:
https://www.npmjs.com/package/@graphprotocol/staging-testnet-subgraph

This package has it's own set of contracts, separate from the testnet subgraph we use for the indexers.