Auto-generate the reference assemblies to normalize them (dotnet/corefx#39681)

Auto-generate the reference assemblies to normalize them (dotnet/corefx#39681)

* Update Microsoft.VisualBasic.Core ref

* Update System.Collections.Concurrent ref

* Update System.Collections.Immutable ref

* Update System.Collections ref

* Update System.ComponentModel.Composition ref

* Update System.Data.Common ref

* Update System.Data.OleDb ref

* Update System.Data.SqlClient ref for netcoreapp

* Update System.Diagnostics.DiagnosticSource ref and DiagnosticSourceActivity.cs

* Update System.IO.Packaging ref for netcoreapp

* Update System.IO.Pipelines ref

* Update System.Linq ref

* Update System.Net.Http ref

* Update System.Net.Security ref

* Update System.Numerics.Tensors ref

* Update System.Reflection.Emit for netcore

* Update System.Security.AccessControl ref

* Update System.Security.Permissions ref

* Update System.ServiceModel.Syndication ref

* Update System.Text.Encodings.Web ref

* Update System.Threading.Channels ref for netcoreapp

* Update System.Utf8String.Experimental ref

* Update System.Utf8String.Experimental csproj to reference new file.

* Upat eSystem.Runtime ref and Manual ref

* Update Microsoft.Bcl.AsyncInterfaces ref

* Disable warning CS8617 for missing nullability annotations within
explicit interface methods.

* Revert System.Runtime.cs back to what's in master.

* Update System.Runtime ref (single change - System.Char -> char).

* Revert System.Collections.Immutable back to what's in master (keep
readonly on private fields).

* Update System.Runtime ref and add comment in Manual ref file for
TypedReference.

Commit migrated from https://github.com/dotnet/corefx/commit/bdd0814360d4c3a58860919f292a306242f27da1