test(e2e): change consitently to eventually (#12097)

## Motivation

I've noticed a flake in a specific test. We are using `Consistently`,
which expects that error code `52` will always be returned. This is a
correct assumption, unless something happens on the network and we
receive a different error code.

```
  [FAILED] Failed after 0.250s.
  The function passed to Consistently failed at github.com/kumahq/kuma/test/e2e/reachableservices/auto_reachable_services_k8s.go:100 with:
  Expected
      <int>: 56
  to equal
      <int>: 52
Error: It 11/22/24 10:02:24.833
```

## Implementation information

To avoid this flake, I changed `Consistently` to `Eventually` and added
`MustPassRepeatedly`. We cannot guarantee that the network is 100%
reliable, so we have two options:

* Add another error code to check, or
* If it fails, wait for 5 consecutive successes.

## Supporting documentation

https://github.com/kumahq/kuma/actions/runs/11969768862/job/33372432545

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Signed-off-by: Lukasz Dziedziak <[email protected]>

test/e2e/reachableservices/auto_reachable_services_k8s.go

@@ -89,7 +89,7 @@ spec:
 			g.Expect(stdout).To(ContainSubstring("first-test-server_reachable-services_svc_80"))
 		}, "30s", "1s").Should(Succeed())
 
-		Consistently(func(g Gomega) {
+		Eventually(func(g Gomega) {
 			failures, err := client.CollectFailure(
 				KubeCluster,
 				"second-test-server",
@@ -98,7 +98,7 @@ spec:
 			)
 			g.Expect(err).To(Not(HaveOccurred()))
 			g.Expect(failures.Exitcode).To(Equal(52))
-		}, "5s", "1s").Should(Succeed())
+		}, "15s", "1s", MustPassRepeatedly(5)).Should(Succeed())
 	})
 
 	It("should connect to ExternalService when MeshTrafficPermission defined", func() {