Add workaround for dotnet/linker#1298 (#23368)

Author: pranavkm

src/Razor/Microsoft.NET.Sdk.Razor/src/build/netstandard2.0/LinkerWorkaround.xml

@@ -23,4 +23,7 @@
       <method signature="System.Void .ctor()" />
     </type>
   </assembly>
+
+  <!-- Workaround for https://github.com/mono/linker/issues/1298 -->
+  <assembly fullname="System.Security.Cryptography.X509Certificates" />
 </linker>