bug: GetLatestWorkspaceBuildsByWorkspaceIDs creates a lot of DB load

[spikecurtis]

In our dogfood deployment over 5 days in early June:

Avg Execution Time: 26.01ms
Num Times Called: 639802
Avg Rows: 1

https://www.notion.so/coderhq/GetLatestWorkspaceBuildsByWorkspaceIDs-209d579be592806d8153d1ef2333f2f3?source=copy_link