[BG-7750] Remove TBTG fee info test
[BG-7750] Remove TBTG fee info test

Summary: TBTG doesn't exist, but there's a test to get fee info from the platform, which is breaking all SDK builds

Reviewers: kevin, tyler, leo, bigly, zacleids

Reviewed By: zacleids

Subscribers: tyler, mark

Differential Revision: https://phabricator.bitgo.com/D9844

BitGo/BitGoJS,BitGo/BitGoJS,BitGo/BitGoJS,BitGo/BitGoJS