PR Summary

Previously, parse error were not reported in the summary. With this PR, the exit code from -EnableExit matches the number of diagnostics reported by -ReportSummary and parse errors are included under errors. Since -ReportSummary output is sent directly to the host, I don't believe this to be a breaking change.

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.
  • If the PR is work in progress, please add the prefix WIP: to the beginning of the title and remove the prefix when the PR is ready.