[Microsoft.Sbom.Targets] License detection properties have no effect

[KalleOlaviNiemitalo]

These properties don't take effect when I set them in my project:

<PropertyGroup>
    <SbomGenerationFetchLicenseInformation>true</SbomGenerationFetchLicenseInformation>
    <SbomGenerationEnablePackageMetadataParsing>true</SbomGenerationEnablePackageMetadataParsing>
</PropertyGroup>

They are passed to parameters of the GenerateSbom task, but the resulting SBOM contains no license information, and the SBOMTelemetry log entry shows FetchLicenseInformation=null, EnablePackageMetadataParsing=null.

If I instead use sbom-tool with -pm true -li true, then the SBOM shows "licenseConcluded": "MIT" and/or "licenseDeclared": "MIT" for some packages, so the bug is in the MSBuild integration.

AFAICT, src/Microsoft.Sbom.Targets/SbomCLIToolTask.cs for .NET Framework uses those parameters (but then fails because of #719), but src/Microsoft.Sbom.Targets/GenerateSbomTask.cs for .NET Core ignores the parameters.

Originally posted by @KalleOlaviNiemitalo in #693 (comment)