Use correct migration finalisation method
What does this MR do and why?
Describe in detail what your merge request does and why.
This MR fixes the method used to finalise the following batched background migrations:
ResetDuplicateCiRunnersTokenValues
ResetDuplicateCiRunnersTokenEncryptedValues
According to https://gitlab.com/gitlab-org/release/docs/-/blob/master/general/patch/process_new.md#gitlab-project, when this MR is merged we'll want to cherry-pick it into a new MR targeting the latest %15.6 tag.
Part of #376709 (closed)
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