chore: refactor polls

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What does this PR do?

🤖 Generated by Copilot at dbab92f

Refactored the Snapshot component to use a worker for fetching proposal data, renamed some variables and functions for clarity, and added a new handler function to the snapshot-relay worker. These changes improve the performance, readability, and consistency of the code.

Related issues

Fixes # (issue)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Enhancement (non-breaking small changes to existing functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Explanation of the changes

🤖 Generated by Copilot at dbab92f

• Replace useSpaceQuery hook with useQuery hook that calls getSnapshotProposal function to fetch proposal data from snapshot-relay worker (link,link)
• Add conditional check to return null if proposal data is falsy in Snapshot component (link)
• Add getSpaceId handler function to snapshot-relay worker that queries Snapshot API for proposal data and returns JSON response (link)
• Rename snapshotId parameter to proposalId in generateSnapshotAccount function and documentation to avoid confusion with Snapshot API (link,link)
• Rename PROPOSAL_CREATOR_TESTNET_PRIVATE_KEY environment variable to TESTNET_PROPOSAL_CREATOR_PRIVATE_KEY in snapshot-relay worker .dev.vars file to match naming convention (link)

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