Fix flaky integration test by adding one more check

[lubronzhan]

What this PR does / why we need it:
Add check of lb.ingress length. In case it will fail like this
https://github.com/vmware-tanzu/load-balancer-operator-for-kubernetes/actions/runs/8930964320/job/24532158192?pr=237

•! Panic [1.013 seconds]
Integration tests
/home/runner/work/load-balancer-operator-for-kubernetes/load-balancer-operator-for-kubernetes/pkg/test/builder/test_suite.go:153
  ClusterController Test
  /home/runner/work/load-balancer-operator-for-kubernetes/load-balancer-operator-for-kubernetes/controllers/cluster/suite_test.go:68
    EnsureHAService
    /home/runner/work/load-balancer-operator-for-kubernetes/load-balancer-operator-for-kubernetes/controllers/cluster/cluster_intg_test.go:26
      when Avi is HA provider
      /home/runner/work/load-balancer-operator-for-kubernetes/load-balancer-operator-for-kubernetes/controllers/cluster/cluster_intg_test.go:73
        when FQDN HA service endpoint exist
        /home/runner/work/load-balancer-operator-for-kubernetes/load-balancer-operator-for-kubernetes/controllers/cluster/cluster_intg_test.go:109
          should create service and endpoint when FQDN is resolved [It]
          /home/runner/work/load-balancer-operator-for-kubernetes/load-balancer-operator-for-kubernetes/controllers/cluster/cluster_intg_test.go:134

          Test Panicked
          runtime error: index out of range [0] with length 0
          /home/runner/go/pkg/mod/github.com/onsi/[email protected]/internal/async_assertion.go:321

          Full Stack Trace
          github.com/onsi/gomega/internal.(*AsyncAssertion).buildActualPoller.func3.1()

Which issue(s) this PR fixes:

Fixes #

Describe testing done for PR:

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