chore: add tx metrics and logs for serialization errors (#15215)

Before db_metrics were all or nothing. Now `InTx` metrics are always recorded, and query metrics are opt in.


Adds instrumentation & logging around serialization failures in the database.

coderd/templates.go

@@ -467,7 +467,7 @@ func (api *API) postTemplateByOrganization(rw http.ResponseWriter, r *http.Reque
 		templateVersionAudit.New = newTemplateVersion
 
 		return nil
-	}, nil)
+	}, database.DefaultTXOptions().WithID("postTemplate"))
 	if err != nil {
 		httpapi.Write(ctx, rw, http.StatusInternalServerError, codersdk.Response{
 			Message: "Internal error inserting template.",