roachtest: collect qps metrics over longer window in gracefuldrain test

The gracefuldrain test was modernized in cf30717.
Prior to that commit, QPS metrics were collected over a 10s interval,
whereas the modernization refactor changed this to 1 second intervals.
Looking at a few recent test failures, I see QPS metrics above the failure
threshold, which makes me think suspect that this 1s interval is causing
the sorts of inaccuracies MeasureQPS warns against.
Also See cockroachdb#133020 (comment).

One thing that doesn't line up is the timeline of this tests failure and
cf30717. Still, this patch changes the
metric's interval back to 10s.

References cockroachdb#133020

Release note: None

pkg/cmd/roachtest/tests/kv.go

@@ -15,6 +15,7 @@ import (
 	"sync/atomic"
 	"time"
 
+	"github.com/cockroachdb/cockroach/pkg/base"
 	"github.com/cockroachdb/cockroach/pkg/cmd/roachtest/cluster"
 	"github.com/cockroachdb/cockroach/pkg/cmd/roachtest/option"
 	"github.com/cockroachdb/cockroach/pkg/cmd/roachtest/registry"
@@ -602,7 +603,7 @@ func registerKVGracefulDraining(r registry.Registry) {
 			}()
 
 			verifyQPS := func(ctx context.Context) error {
-				if qps := measureQPS(ctx, t, c, time.Second, c.Range(1, nodes-1)); qps < expectedQPS {
+				if qps := measureQPS(ctx, t, c, base.DefaultMetricsSampleInterval, c.Range(1, nodes-1)); qps < expectedQPS {
 					return errors.Newf(
 						"QPS of %.2f at time %v is below minimum allowable QPS of %.2f",
 						qps, timeutil.Now(), expectedQPS)