:art: feat: Reusable `ethereum-wallet-mock` package

[matstyler]

TL;DR

Updated the Test Dapp to use Ethereum Wallet Mock instead of MetaMask.

What changed?

• Replaced MetaMaskMock with EthereumWalletMock in the Test Dapp
• Added methods for importing wallets and adding new accounts in EthereumWalletMock

How to test?

• Instructions for testing have been added to the test files

Why make this change?

To provide better support for Ethereum wallets and improve testing capabilities in the Test Dapp

---

Motivation and context

Replaced metamask-mock package by general ethereum-wallet-mock.

Does it fix any issue?

#(issue)

Quality checklist

• [x] I have performed a self-review of my code.
• [x] If it is a core feature, I have added thorough e2e tests.

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