Remove experimental annotation from provision network

[fredms]

Description

Please add an informative description that covers that changes made by the pull request and link all relevant issues.

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All SDK Contribution checklist:

• The pull request does not introduce [breaking changes]
• CHANGELOG is updated for new features, bug fixes or other significant changes.
• I have read the contribution guidelines.

General Guidelines and Best Practices

• Title of the pull request is clear and informative.
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Testing Guidelines

• Pull request includes test coverage for the included changes.

[github-actions]

Thank you for your contribution @fredms! We will review the pull request and get back to you soon.

[azure-sdk]

API change check

APIView has identified API level changes in this PR and created following API reviews.

azure-ai-ml