feat(coderd/database): add dbrollup service to rollup insights (#12665)

Add `dbrollup` service that runs the `UpsertTemplateUsageStats` query
every 5 minutes, on the minute. This allows us to have fairly real-time
insights data when viewing "today".

coderd/database/dbpurge/dbpurge.go

@@ -24,6 +24,7 @@ const (
 // This is for cleaning up old, unused resources from the database that take up space.
 func New(ctx context.Context, logger slog.Logger, db database.Store) io.Closer {
 	closed := make(chan struct{})
+	logger = logger.Named("dbpurge")
 
 	ctx, cancelFunc := context.WithCancel(ctx)
 	//nolint:gocritic // The system purges old db records without user input.