[Cashtab] Implement standardized test wrappers in Receive.test.js

Summary:
T3444

Implement standardized test wrapper in Receive tests. Add a test to confirm onboarding condition. Combine tests that do not require re-renders.

Test Plan: npm test

Reviewers: #bitcoin_abc, emack

Reviewed By: #bitcoin_abc, emack

Differential Revision: https://reviews.bitcoinabc.org/D15564