Re-generated Network for August release

[anton-evseev]

Description

Based on:

• Azure Network August release azure-rest-api-specs#3635
• Update required properties for Outbound Rules azure-rest-api-specs#3711

---

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• Please add REST spec PR link to the SDK PR
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• Pull request includes test coverage for the included changes.

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• If an SDK is being regenerated based on a new swagger spec, a link to the pull request containing these swagger spec changes has been included above.
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[anton-evseev]

Previous PR: #4675

[anton-evseev]

@dsgouda could you please take a look?

[dsgouda]

LGTM
@number213 Like I pointed out on the earlier PR the network REST API has been stable for quite some time but the Nuget packages are still preview
Do you have a plan to release a stable version?
We recommend stable Nuget package versions for stable REST APIs
@MikhailTryakhov FYI