[Cashtab] Deprecate antd select from Configure screen

Summary:
T2207

Use a custom select component instead of antd. Add a test to confirm it is working as expected.

Test Plan: npm test

Reviewers: #bitcoin_abc, emack

Reviewed By: #bitcoin_abc, emack

Subscribers: emack

Differential Revision: https://reviews.bitcoinabc.org/D15914