chore(js-ts): migrate app/util/test/ganache.js to TypeScript

[devin-ai-integration]

Summary

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

Changes:

• Renamed ganache.js → ganache.ts
• Added explicit TypeScript types for all class properties, method parameters, and return types
• Imported EthereumProvider and ServerOptions types from the ganache package
• Defined GanacheOptions type that extends ServerOptions<'ethereum'> with a required mnemonic field
• Typed the private _server property using ReturnType<typeof ganache.server>
• Added explicit provider null checks in getAccounts() and getBalance() to preserve the original fail-fast behavior (instead of silently returning undefined/NaN via optional chaining)
• No import path changes needed in consuming files — extensionless imports resolve to .ts automatically

Review & Testing Checklist for Human

• Verify the ganache package exports EthereumProvider and ServerOptions types correctly (ganache v7.9.2)
• Run the e2e test suite that exercises Ganache (fixture-helper / ganache-seeder flows) to confirm no runtime regressions

Notes

• Three files import from this module (e2e/fixtures/utils.js, e2e/fixtures/fixture-helper.js, wdio/utils/ganache.js) — all use extensionless import paths so no changes are required
• The GanacheOptions type enforces the mnemonic field at the type level, matching the existing runtime check
• CI failures are all pre-existing infrastructure issues unrelated to this change (react-native-tcp 404, missing CLA branch, missing CI secrets)

Link to Devin session: https://app.devin.ai/sessions/7a79f1cc0e8c4fd3bef7dacb53bf19e5
Requested by: @shayanshafii

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