Handle queued MediaConvert job in CheckThumbnailFunction function

[jkielbaey]

Issue #, if available:

The Lambda function CheckThumbnailFunction fails when checking the status of the MediaConvert job that is still queued (status: SUBMITTED).

Description of changes:

This PR adds a check in the condition to support this status. When the MediaConvert job is still queued, it will be handled the same way as it was still being processed by MediaConvert.

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