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NetworkPolicy e2e: named port egress test
**What this PR does / why we need it**:
Add an e2e NetworkPolicy test that ensures that an egress rule that specifies a named port properly applies to egress traffic.
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes#52040
**Special notes for your reviewer**:
**Release note**:
```release-note
NONE
```
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