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authz/github: allocate less memory for groupsCache disabled path

Administrator requested to merge authz/github-avoid-allocating-memory into main

Created by: bobheadxi

We assign to seenUsers and seenRepos while syncing users, this can double the memory usage of a sync for no use because the groupsCache disabled code path does not make use of the maps for deduplication (none is necessary).

Follow-up to the groupsCache permissions work. Prompted by some performance discussion on Slack. Tests already cover behaviour of both code paths, and they passed locally.

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