[FLINK-20830][BP 1.14][k8s] Add type of Headless_Cluster_IP for external rest …

[Aitozi]

…service

This is backport for PR

[Aitozi]

Please take a look when you are free @wangyang0918

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• 2f664f0 Azure: SUCCESS

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[wangyang0918]

Thanks for backporting to release-1.14.

+1 for merging.