CLOUDP-349340: transient build for generated manifests

[s-urbaniak]

Summary

This removes presumably unnecessary manifest artifacts that are supposed to be generated during releases only.

Proof of Work

Passing e2e tests.

Checklist

• Have you linked a jira ticket and/or is the ticket in the title?
• Have you checked whether your jira ticket required DOCSP changes?
• Have you checked for release_note changes?
• Have you signed our CLA?

Reminder (Please remove this when merging)

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