chore: adds snapshots to use the same blockchain status before each mav2 test

[linnall]

Pull Request Checklist

• Did you add new tests and confirm existing tests pass? (yarn test)
• Did you update relevant docs? (docs are found in the site folder, and guidelines for updating/adding docs can be found in the contribution guide)
• Do your commits follow the Conventional Commits standard?
• Does your PR title also follow the Conventional Commits standard?
• If you have a breaking change, is it correctly reflected in your commit message? (e.g. feat!: breaking change)
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• Did you follow the contribution guidelines?

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PR-Codex overview

This PR enhances the functionality of the instance management by adding a getTestClient method and related snapshot functionality, allowing for better testing capabilities.

Detailed summary

• Added createTestClient import from viem.
• Introduced getTestClient method in defineInstance to create a test client.
• Updated test file to use getTestClient for snapshot management.
• Added snapshotId and revert functionality in the test setup.

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[graphite-app]

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