Setting `tls.enabled=true` and `listeners.admin.tls.enabled=false` misconfigures monitoring

Forgive the brevity, this is me passing along an error report from a slack thread.

Given a set of values like the following:

values: {
    monitoring: {
        enabled: true,
    },
    tls: {
        enabled: true,
    },
    console: {
        enabled: true,
        config: {
            kafka: {
                tls: {
                    enabled: false,
                }
            },
        },
    },
    external: {
        enabled: false,
    },
    // Listener configuration
    listeners: {
        // Disable TLS for admin API since we do not expose it externally
        // and have had issues running some rpk commands which access
        // both the admin API and Kafka API behind TLS.
        admin: {
            tls: {
                enabled: false,
            },
            external: {
                tls: {
                    enabled: false,
                }
            }
        }
    }
}

servicemonitor.yml will generate an incorrect ServiceMonitor because it does not consult the listeners values for information on TLS.

We should make some intermediate renderings/helpers to consolidate TLS definitions and then use that to control whether or not our ServiceMonitor uses http or https.

JIRA Link: K8S-100

redpanda-data / helm-charts

Setting `tls.enabled=true` and `listeners.admin.tls.enabled=false` misconfigures monitoring #1013