soft-delete-cost-analysis: fixing return type

[marcinlimanski]

Description

Fixing run time error with return type

[google-cla[bot]]

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[marcinlimanski]

@msampathkumar do you have any other question?

[iennae]

@marcinlimanski thanks for the PR and your first time contribution to the repository. It looks like you need to sign the CLA before we can accept this request.

[marcinlimanski]

@iennae Thanks for the reminder, CLA is signed. PR ready to go.