Seed admin token once in upgrade scenario
What does this MR do and why?
Skips seeding the admin token during the second half of the upgrade test since it would have been already seeded during the first half.
Fixes https://gitlab.com/gitlab-org/gitlab-qa/-/issues/678
MR acceptance checklist
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I have evaluated the MR acceptance checklist for this MR.
Edited by George Koltsov