change release build to be more specific with regard to the assemblies to check with binskim

[JamesWTruher]

PR Summary

since we only ship a small number of assemblies, we should only check those with binskim.

Also sign the plurilize.net assembly with a third party cert

PR Checklist

• PR has a meaningful title
  • Use the present tense and imperative mood when describing your changes
• Summarized changes
• Change is not breaking
• Make sure all .cs, .ps1 and .psm1 files have the correct copyright header
• Make sure you've added a new test if existing tests do not effectively test the code changed and/or updated documentation
• This PR is ready to merge and is not Work in Progress.
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