[FEATURE] Implement e2e testing

[tombeckenham]

Issue to be solved

There are currently no automated tests for the extension. This makes it both difficult for developers to know whether they have broken code and difficult for QA to manually cover every aspect of the codebase. Implementing some basic e2e testing would additionally help to document the codebase by providing automated step by step run throughs of common features.

Suggest A Solution

Implement Playwright e2e testing to cover basic features within the extension.

It should cover:

• Sign up
• Recovery
• Sending & Moving Transactions & NFTs

Responses should be mocked or seeded locally instead of using testnet or mainnet.

New features and bug fixes should include their own tests