bug: GetUserByID is called millions of times per day on dogfood

[spikecurtis]

https://console.cloud.google.com/sql/instances/dogfood-v2/insights;database=coder;start=2025-06-12T05:40:45.797Z;end=2025-06-19T05:40:45.797Z;trace=5ea35b1dc801b64cb07b3dab7052c653;span=8e7a13fed1030f55;query_hash=8569081770066747631;sort_by=TOTAL_EXEC_TIME?inv=1&invt=Ab0giQ&project=coder-dogfood-v2

Suggests that we are polling or calling it in a loop as part of another operation