This patch updates the Flux Operator Deployment to remove hostPort and
hostNetwork, ensuring that ports 8080 and 8081 are only accessible
within the cluster. This prevents external exposure and improves
security.
```release-note
[flux] Close Flux Operator ports (8080/8081) to external access for improved security.
```
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## What this PR does
### Release note
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## Summary by CodeRabbit
* **Security**
* Added a cluster-wide network policy for the Flux Operator to block
external access to internal service ports (notably TCP 8080 and 8081)
while preserving intra-cluster communication.
* **Chores**
* Update process now applies the new network policy as part of Flux
Operator deployments.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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