Remove unused dependencies

[paulmedynski]

The MDS 6.1 .NET Framework project currently references the following packages:

Project 'Microsoft.Data.SqlClient' has the following package references
   [net462]:
   Top-level Package                                         Requested        Resolved
   > Azure.Core                                              [1.47.1,2.0.0)   1.47.1
   > Azure.Identity                                          1.14.2           1.14.2
   > Microsoft.Bcl.Cryptography                              8.0.0            8.0.0
   > Microsoft.Data.SqlClient.SNI                            6.0.2            6.0.2
   > Microsoft.Extensions.Caching.Memory                     8.0.1            8.0.1
   > Microsoft.IdentityModel.JsonWebTokens                   7.7.1            7.7.1
   > Microsoft.IdentityModel.Protocols.OpenIdConnect         7.7.1            7.7.1
   > Microsoft.NETFramework.ReferenceAssemblies        (A)   [1.0.3, )        1.0.3
   > System.Buffers                                          4.5.1            4.5.1
   > System.Security.Cryptography.Pkcs                       8.0.1            8.0.1
   > System.Text.Encodings.Web                               8.0.0            8.0.0
   > System.Text.Json                                        8.0.5            8.0.5

Microsoft.Bcl.Cryptography and System.Text.Encodings.Web are referenced, but I can't find any use of them in the code. They should be removed from the project.

Audit all of the projects whose artifacts we publish in NuGet packages for unused dependencies, on main and the 3 servicing branches (6.1, 6.0. 5.1).

There are also some dependencies that we use directly but are currently missing from our projects and nuspecs:

• Microsoft.Identity.Client
• System.Data.Common (.NET Framework)
• System.Diagnostics.DiagnosticSource
• System.IdentityModel.Tokens.Jwt
• System.Text.Json (.NET Standard 2.0)
• System.Memory (.NET Framework)
• System.Security.Cryptography.Pkcs (.NET Framework)
• System.Text.RegularExpressions (.NET Framework)