Only accept unit_primitive_name into .headers

What does this MR do and why?

This is the final step of Replace remaining AvailableServices.find_by_nam... (#564979 - closed)

  • Removes the temporary workaround that accepts both service objects and UP names. We only accept UP names now.
  • Renames the service parameter to unit_primitive_name

How to set up and validate locally

It's no-op. We can refer to each of the MRs under #564979 (closed). Each MR lists validation steps for particular call sites.

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Related to #564979 (closed)

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