Issues with Post Interview Action Reminder email notification when interview 2 is scheduled

[sdgun]

Steps
Issue 1
In the below instance, noticed two records on the same candidate interview 1 and 2. When we schedule interview 2 we shouldn't receive post interview reminder on interview 1)

Job title: ABC
Link to the interview: https://platform.topcoder-dev.com/taas/myteams/18690/positions/05bdcac3-b86b-4070-bfe3-483c1cb47706/candidates/interviews

Issue 2
No Post Interview Action Reminder email notification received on the below Interview 2 but received in app notification:

Interview(2):
https://platform.topcoder-dev.com/taas/myteams/18690/positions/05bdcac3-b86b-4070-bfe3-483c1cb47706/candidates/interviews

Gmail(only received interview completed email):

In app notifications are received as expected:

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Sum up:

• For now we have to fix only the first part: avoid duplicated interviews. I guess this happens because for one JobCandidate we can re-schedule interview so there could be multiple rounds: 1, 2 and 3. So we only have to send email for the last round.
• We also must ensure, that we don't send duplicate notification for interview completed reminder ('taas.notification.interview-awaits-resolution').
• Please, create demo data with several rounds of interview so we could check that only 1 interview is listed in email when we run demo script https://github.com/topcoder-platform/taas-apis/tree/dev/scripts/demo-email-notifications

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Paid via https://www.topcoder.com/challenges/c9133133-ce3f-4aa5-a762-7cd8c705c0fe

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@sdgun the first part of this issue is ready for review.

QA guidelines:

• check that if we schedule 2-3 rounds then Post Interview Action Reminder email list only the latest round for the Job Candidate
• verify the same for Interview Awaits Resolution email

[sdgun]

Verified Post Interview Action Reminder email and Interview Awaits Resolution email with 1st, 2nd and 3rd interviews, both emails only had the latest round for the job candidate.