Move testnet.snapshot.org to sepolia

[ChaituVR]

Tasks

Beta Give feedback

1. Enable delegation on sepolia snapshot.js#978
   3 of 3
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2. Support Safe voting on sepolia safe,, remove support for goerli on relayer fix: Add support for sepolia and remove support for goerli snapshot-relayer#215
3. Add ens data for sepolia and add ens subgraph field snapshot.js#980
   +0
4. Make sure demo UI is working with sepolia Add ENS support for sepolia #4622
5. Check if we are able to create spaces/update space settings with Sepolia's ENS names
6. Announce about DB reset and goerli deprecation
7. [After announcement] Just before announced time, make sure maintainance is enabled on testnet.snapshot.org
8. [After announcement] Backup existing testnet hub DB and testnet sequencer DB
9. [After announcement] DB reset for snapshot-testnet and snapshot-sequencer-testnet
10. [After announcement] Update env in testnet UI and sequencer
11. Deprecate Goerli network and delegation subgraph snapshot.js#985
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[samuveth]

@ChaituVR shouldn't we announce the DB reset asap?