Updated `Program.cs` to eliminate the Windows service conditional check.
Updated `DigitalData.Core.Abstractions` and `DigitalData.Core.Application`
to versions 3.4.1 and 3.2.1, respectively. Removed the
`DigitalData.Core.Infrastructure` package reference. In
`DigitalData.UserManager.Infrastructure.csproj`, updated
`DigitalData.Core.Infrastructure` to version 2.0.1 and added
`Microsoft.EntityFrameworkCore.Relational` for net7.0, net8.0,
and net9.0 with corresponding versions.
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