[Cashtab] Standardize and improve Home integration tests

Summary:
T3444

Apply new standard wrapper to Home.test.js. Remove data-testid gets for some components and replace with better way of getting them.

Remove tests from App.test.js that are covered in Home.test.js.

Test Plan: npm test

Reviewers: #bitcoin_abc, PiRK

Reviewed By: #bitcoin_abc, PiRK

Differential Revision: https://reviews.bitcoinabc.org/D15509