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

[spikecurtis]

https://console.cloud.google.com/sql/instances/dogfood-v2/insights;database=coder;start=2025-06-12T05:35:53.754Z;end=2025-06-19T05:35:53.754Z;trace=caf3f72d2d52ee6b76e0bd2bd2199fc0;span=2b9be00551790f29;query_hash=5447534200989563475;sort_by=TOTAL_EXEC_TIME?inv=1&invt=Ab0giQ&project=coder-dogfood-v2

This suggests we are polling or calling it in a loop as part of some other operation.