Prerelease update bug

[anamnavi]

PR Summary

Fix bug related to updating a prerelease version package. If the package has latest prerelease version, the discrepancy with System.Version and NuGetVersion instances used for latest version comparison was causing the latest preview version to be attempted to be reinstalled. With this fix it can detect correctly if it the latest version is the latest and not reinstall.

PR Context

Fixes #464 #818

PR Checklist

• [ ] PR has a meaningful title
  • Use the present tense and imperative mood when describing your changes
• [ ] Summarized changes
• [ ] Make sure all .h, .cpp, .cs, .ps1 and .psm1 files have the correct copyright header
• [ ] This PR is ready to merge and is not Work in Progress.
  • If the PR is work in progress, please add the prefix WIP: or [ WIP ] to the beginning of the title (the WIP bot will keep its status check at Pending while the prefix is present) and remove the prefix when the PR is ready.
• Breaking changes
  • [ ] None
  • OR
  • [ ] Documentation needed
    • [ ] Issue filed:
• User-facing changes
  • [ ] Not Applicable
  • OR
  • [ ] Documentation needed
    • [ ] Issue filed:
• Testing - New and feature
  • [ ] N/A or can only be tested interactively
  • OR
  • [ ] Make sure you've added a new test if existing tests do not effectively test the code changed
• Tooling
  • [ ] I have considered the user experience from a tooling perspective and don't believe tooling will be impacted.
  • OR
  • [ ] I have considered the user experience from a tooling perspective and enumerated concerns in the summary.