Rewrite nuget min package age meta responses

[SanderDeclerck]

Summary by Aikido

Security Issues: 0	🔍 Quality Issues: 2	Resolved Issues: 0

🚀 New Features

• Added NuGet min-package-age filtering with catalogs, flat lists, tests.

⚡ Enhancements

• Integrated MinPackageAge into Firewall and RuleNuget response handling.
• Marked modified NuGet metadata responses uncacheable by stripping cache headers.

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