Use .NET's newer -getProperty capability

[bwateratmsft]

Fixes #195. This replaces our confusing targets files with simpler command lines and parsing. I also added some refinements to ensure that the expected data is always present, or else a good error message is thrown.

Makes a few important changes as well based on current supported .NET versions--

• For .NET project info:
  • No longer includes the workarounds for .NET 10 Previews 3-6
  • No longer considers the SDKContainerSupportEnabled property
• For Blazor info:
  • No longer supports XML manifests (they are out-of-support in .NET)

Things to test:

• .NET 10
  • SDK
  • Dockerfile
• .NET 9
  • SDK
  • Dockerfile
• .NET 8
  • SDK
  • Dockerfile
• Blazor w/ static web assets (any supported version is sufficient proof)

[Copilot]

Pull request overview

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