fix: Readiness probe to use broker listener

[adwk67]

Description

Fixes #829

Openshift 🟢

--- PASS: kuttl (389.17s)
    --- PASS: kuttl/harness (0.00s)
        --- PASS: kuttl/harness/configuration_kafka-latest-3.7.2_zookeeper-latest-3.9.2_openshift-true (42.14s)
        --- PASS: kuttl/harness/kerberos_kafka-3.9.0_zookeeper-latest-3.9.2_openshift-true_krb5-1.21.1_kerberos-realm-PROD.MYCORP_kerberos-backend-mit (83.44s)
        --- PASS: kuttl/harness/upgrade_zookeeper-3.9.2_upgrade_old-3.7.1_upgrade_new-3.9.0_use-client-tls-true_use-client-auth-tls-true_openshift-true (146.49s)
        --- PASS: kuttl/harness/smoke_kafka-3.9.0_zookeeper-3.9.2_use-client-tls-true_openshift-true (81.28s)
        --- PASS: kuttl/harness/tls_kafka-3.9.0_zookeeper-latest-3.9.2_use-client-tls-true_use-client-auth-tls-true_openshift-true (141.93s)
        --- PASS: kuttl/harness/cluster-operation_kafka-latest-3.7.2_zookeeper-latest-3.9.2_openshift-true (100.81s)
        --- PASS: kuttl/harness/logging_kafka-3.9.0_zookeeper-latest-3.9.2_openshift-true (86.17s)
        --- PASS: kuttl/harness/delete-rolegroup_kafka-3.9.0_zookeeper-latest-3.9.2_openshift-true (51.26s)
PASS

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1. Changes are OpenShift compatible
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3. Integration tests passed (for non trivial changes)
4. Changes need to be "offline" compatible

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1. Code contains useful comments
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[adwk67]

Re-ran the affected tests:

--- PASS: kuttl (247.55s)
    --- PASS: kuttl/harness (0.00s)
        --- PASS: kuttl/harness/kerberos_kafka-3.9.0_zookeeper-latest-3.9.3_openshift-false_krb5-1.21.1_kerberos-realm-CLUSTER.LOCAL_kerberos-backend-mit_broker-listener-class-cluster-internal_bootstrap-listener-class-cluster-internal (79.07s)
        --- PASS: kuttl/harness/kerberos_kafka-3.9.0_zookeeper-latest-3.9.3_openshift-false_krb5-1.21.1_kerberos-realm-PROD.MYCORP_kerberos-backend-mit_broker-listener-class-cluster-internal_bootstrap-listener-class-cluster-internal (86.13s)
        --- PASS: kuttl/harness/kerberos_kafka-3.9.0_zookeeper-latest-3.9.3_openshift-false_krb5-1.21.1_kerberos-realm-CLUSTER.LOCAL_kerberos-backend-mit_broker-listener-class-cluster-internal_bootstrap-listener-class-external-unstable (79.17s)
        --- PASS: kuttl/harness/kerberos_kafka-3.9.0_zookeeper-latest-3.9.3_openshift-false_krb5-1.21.1_kerberos-realm-CLUSTER.LOCAL_kerberos-backend-mit_broker-listener-class-cluster-internal_bootstrap-listener-class-external-stable (80.31s)
        --- PASS: kuttl/harness/kerberos_kafka-3.9.0_zookeeper-latest-3.9.3_openshift-false_krb5-1.21.1_kerberos-realm-PROD.MYCORP_kerberos-backend-mit_broker-listener-class-cluster-internal_bootstrap-listener-class-external-unstable (80.82s)
        --- PASS: kuttl/harness/kerberos_kafka-3.9.0_zookeeper-latest-3.9.3_openshift-false_krb5-1.21.1_kerberos-realm-PROD.MYCORP_kerberos-backend-mit_broker-listener-class-cluster-internal_bootstrap-listener-class-external-stable (80.61s)
PASS

[siegfriedweber]

LGTM