chore: migrate app/util/test/ganache.js to TypeScript

[devin-ai-integration]

Summary

Migrates app/util/test/ganache.js from JavaScript to TypeScript by:

• Adding proper type imports from the ganache package (Server, ServerOptions, EthereumProvider)
• Creating a GanacheOptions interface for the start method options
• Adding explicit type annotations to all class methods and properties
• Replacing non-null assertions with explicit null checks to satisfy ESLint rules

Review & Testing Checklist for Human

• Verify the GanacheOptions interface correctly extends ServerOptions without type conflicts
• Run any e2e tests that use the Ganache class to ensure the migration doesn't break test functionality
• Confirm the balanceHex as string type assertion on line 68 is safe for all ganache provider responses

Notes

• The pre-existing typecheck errors in the codebase (related to PreferencesController) are unrelated to this change
• The @typescript-eslint/no-parameter-properties lint error appears on all TS files in the repo and is a configuration issue, not specific to this file

Link to Devin run: https://app.devin.ai/sessions/72022e25d28341ecb8aa0efa27d554eb
Requested by: @shayanshafii

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[devin-ai-integration]

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

View in Devin Review to see 3 additional findings.