[FLINK-17230] Fix incorrect address of Endpoint for external Service with ClusterIP type

[zhengcanbin]

This backports #12277 to 1.11

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[zhengcanbin]

ping @zhijiangW

[wangyang0918]

Checked the k8s related e2e tests works well. +1 for merging.

Since the commit messages have been squashed in master, it is better to keep the same behavior in release-1.11 branch.

cc @zhijiangW

[pnowojski]

Thanks for the review and backporting. As @zhijiangW already gave +1 for backporting in the ticket I'm merging it.