Update package versions and clean up code

- Bump `UserManager` package to version `1.1.1` in
  `EnvelopeGenerator.Application.csproj` and
  `EnvelopeGenerator.Infrastructure.csproj`.
- Add reference to `DigitalData.UserManager.Domain` version
  `3.2.1.0` and `System.ComponentModel.Annotations` version
  `4.7.0` in `EnvelopeGenerator.CommonServices.vbproj`.
- Add reference to `System.Drawing.Common` version `4.7.3`
  in `EnvelopeGenerator.CommonServices.vbproj`.
- Update `UserManager.Domain` package to version `3.2.1`
  in `EnvelopeGenerator.Domain.csproj`.
- Remove unused properties from `EGUser` class in
  `EGUser.cs`.
- Mark `EnvelopeReceiverRepository` as obsolete, suggesting
  to use `Repository` instead.
- Update `packages.config` to include new package versions.

EnvelopeGenerator.CommonServices/packages.config

@@ -30,7 +30,9 @@
   <package id="System.Buffers" version="4.6.0" targetFramework="net462" />
   <package id="System.CodeDom" version="8.0.0" targetFramework="net462" />
   <package id="System.Collections.Immutable" version="8.0.0" targetFramework="net462" />
+  <package id="System.ComponentModel.Annotations" version="4.7.0" targetFramework="net462" />
   <package id="System.Data.Odbc" version="6.0.1" targetFramework="net462" />
+  <package id="System.Drawing.Common" version="4.7.3" targetFramework="net462" />
   <package id="System.IO.Packaging" version="8.0.1" targetFramework="net462" />
   <package id="System.Management" version="8.0.0" targetFramework="net462" />
   <package id="System.Memory" version="4.6.0" targetFramework="net462" />
@@ -41,4 +43,5 @@
   <package id="System.Text.Json" version="8.0.5" targetFramework="net462" />
   <package id="System.Threading.Tasks.Extensions" version="4.5.4" targetFramework="net462" />
   <package id="System.ValueTuple" version="4.5.0" targetFramework="net462" />
+  <package id="UserManager.Domain" version="3.2.1" targetFramework="net462" />
 </packages>