fix: issue #523

[yoution]

@maxceem please review

[maxceem]

@yoution works good, but file src/services/scheduler.js has a lot of method which we don't use.

• Please, don't move code which is not used for the current functionality.
• We already have a file where we store all the methods related to the interview https://github.com/topcoder-platform/taas-app/blob/feature/interview-update/src/services/interviews.js. Please, put methods like getInterview there.
• I've made one mistake in task, instead of data.status === INTERVIEW_STATUS.SCHEDULED || data.status === INTERVIEW_STATUS.RESCHEDULED please, only show the scheduler page if data.status === INTERVIEW_STATUS.SCHEDULING.

[maxceem]

Thanks @yoution, works perfectly now.