Relax criteria for the "Local service not impacted" E2E test

This test has been failing intermittently for a while:

STEP: verifying a local, unexported service is reachable via cluster.local

[FAILED] Timed out after 10.092s.
  There is no failure as the matcher passed to Eventually succeeded on its
      most recent iteration
  In [It] at: .../mcs-api/e2e/localserviceimpact_test.go:167

So the Eventually in checkAllClustersReachable:

Eventually(func(g Gomega) {
...
}, "10s").MustPassRepeatedly(50).Should(Succeed())

does succeed but sometimes does not do so 50 times within 10s. So we
need to relax these criteria, either increase the timeout or decrease
the number of times. I opted for the latter, ie 20 times.

Signed-off-by: Tom Pantelis <tompantelis@gmail.com>

Author: tpantelis

e2e/localserviceimpact_test.go

@@ -21,6 +21,7 @@ import (
 	"fmt"
 	"math/rand"
 	"strings"
+	"time"
 
 	. "github.com/onsi/ginkgo/v2"
 	. "github.com/onsi/gomega"
@@ -164,7 +165,7 @@ var _ = Describe("Local service not impacted", func() {
 				clusterID := strings.TrimSpace(string(stdout))
 				g.Expect(clusterID).To(BeElementOf(clusterIDs))
 				clusters[clusterID]++
-			}, "10s").MustPassRepeatedly(50).Should(Succeed())
+			}).MustPassRepeatedly(20).Within(time.Second * 10).Should(Succeed())
 			Expect(clusters).To(HaveEach(Not(BeZero())))
 		}