Remove auditSources from NuGet.config

[akoeplinger]

The api.nuget.org source will clash with the CFSClean network isolation policy and the same data is provided by AzDO now.

Microsoft Reviewers: Open in CodeFlow

[Copilot]

Pull Request Overview

Removes the auditSources section from NuGet.config to prevent conflicts with CFSClean network isolation policy. The api.nuget.org source in auditSources would clash with network restrictions.

Key Changes

• Removed the entire auditSources configuration block
• Eliminated potential network policy conflicts with api.nuget.org

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