[Microsoft.Sbom.Targets] Rename internal MSBuild properties to minimize risk of conflicts

[KalleOlaviNiemitalo]

In the Microsoft.Sbom.Targets NuGet package, the MSBuild properties UnzipGuid, ShortUnzipGuidFolder, and NugetPackageUnzip should preferably be renamed to something that includes "Sbom", to minimise the risk of conflicts with properties used for other purposes.

But I wonder how necessary a random number even is here. Perhaps the value of $(NugetPackageUnzip) could be just something like $(IntermediateOutputPath)sbom.tmp with no randomness at all. That change might make the unzipped files less likely to exceed the Windows PATH_MAX limit, too.

Originally posted by @KalleOlaviNiemitalo in #693 (comment)

[KalleOlaviNiemitalo]

Guideline in dotnet/msbuild#2480 (comment)

[baronfel]

Chiming in as MSBuild PM to say that this is a good best practice since MSBuild lacks the concept of 'scope'. We've had cases in the past where multiple products used the same property in completely different ways and had unfortunate interactions as a result.

[jlperkins]

We would like to do this, but don't have capacity at the moment to do it ourselves. If you can provide a contribution, we would happily review it.