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Fix a bug that headless service without ports fails to have endpoint created.

**What this PR does / why we need it**:
Follow up of https://github.com/kubernetes/kubernetes/pull/47250. Headless service without ports fails to have corresponding endpoint created because endpoint controller deliberately attaches a dummy endpointPort with portNum=0, which will fail API validation check. Error as below:
```
endpoints_controller.go:375] Error syncing endpoints for service "default/XXX": Endpoints "XXX" is invalid: subsets[0].ports[0].port: Invalid value: 0: must be between 1 and 65535, inclusive
```

This PR makes endpoint controller not attach the dummy endpointPort for headless service.

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #55158, fixes #62440 

**Special notes for your reviewer**:
cc @xiangpengzhao 

**Release note**:

```release-note
Fix a bug that headless service without ports fails to have endpoint created.
```