Test:Remove crucial data from Submission payload

[ptugger]

Description

This PR contains improvements to Multi upload submissions where we need remove un-necessery information
from the json payload of submissions. It will also help to remove crucial data
to be removed from the payload that should not be going to DB like confirmationId,
formName,version,createdAt,fullName,username,email,status,assignee,assigneeEmail and
ateEntry
Example: Sometime end user use the export json file as a bulk
upload payload that contains formId, confirmationId and User
details as well so we need to remove those details from the payload.

Types of changes

Bug fix (non-breaking change which fixes an issue)

Checklist

• I have read the CONTRIBUTING doc
• I have checked that unit tests pass locally with my changes
• I have run the npm script lint on the frontend and backend
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)
• I have approval from the product owner for the contribution in this pull request

Further comments