Provisioner will use .NET 8

[iadgovuser29]

Closes #791 #837

To build:

1. Install the .NET 8 SDK as described by Microsoft for your platform.
2. Check out the repository
   2.a. Ex: git clone https://github.com/nsacyber/HIRS.git
3. cd HIRS_Provisioner.NET
   3.a. Set up build dotnet restore
   3.b. Build & Test dotnet test
4. cd HIRS_Provisioner.NET/hirs
5. If interested in building an RPM or DEB file for linux, install dotnet
   5.a. dotnet tool install --global dotnet-deb
   5.b. dotnet tool install --global dotnet-rpm
6. Create desired installation package MSI building only works on Windows
   6.a. MSI dotnet msbuild hirs.csproj /t:Msi /P:TargetFramework=net8.0 /p:RuntimeIdentifier=win-x64 /p:Configuration=Release
   6.b. Linux RPM dotnet rpm -r linux-x64 -c Release
   6.c. Linux DEB dotnet deb -r linux-x64 -c Release

[iadgovuser26]

Seems to fix the installation issue noted in issue #837