[RW-4091][RISK=NO]Change the return object for cloud task to array of long

[NehaBroad]

The request body for cloud task was set to Object just so RDR is unblocked and we can start export data. This PR is replacing generic Object to Array of Long

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PR checklist

• [ X] This PR meets the Acceptance Criteria in the JIRA story
• [ X] The JIRA story has been moved to Dev Review
• This PR includes appropriate unit tests
• [ X] I have run and tested this change locally
• [ X] If this includes an API change, I have updated the appropriate Swagger definitions and notified API consumers
• If this includes a new feature flag, I have created and linked new JIRA tickets to (a) turn on the feature flag and (b) remove it later

[jmthibault79]

Will you need to update OfflineRdrExportController or will it work as-is?

[NehaBroad]

Will you need to update OfflineRdrExportController or will it work as-is?
OfflineRdrExportController will work as is, its still sending List as JSON