perf(coderd/database): optimize GetWorkspaceAgentAndLatestBuildByAuthToken
#12809
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This query is run 35k/hour on dev.coder.com, this refactor lowers the execution time from 10ms to <0.2ms in my testing (against dev.coder.com DB) and should result in a bit less load.
Original: https://explain.dalibo.com/plan/ggdbc4b4dbeg6b1c
New: https://explain.dalibo.com/plan/ee87631976a2dh62