INT-3297: Refactor tests to use BDD style (#516) * INT-3297: Refactored helpers to not use any agar chaining * INT-3297: Refactored `Loader.tsx` to not use any agar chaining and simplified context usage * INT-3297: Refactored tests to use newer style BDD testing * INT-3297: Fix linting issues * INT-3297: Added `Loader.withVersion` for using miniature to preload TinyMCE Also removed `deleteTinyMCE` from Loader.tsx and moved it to LoadTinyTest.ts