ACR package name should be lowercase when creating ACR urls

[alerickson]

PR Summary

ACR only accepts packages with lowercase names. When uploading blobs to ACR server, the package name should be lowercase (ie ACR will read the package name as being lowercase). The annotations (metadata) will keep the original casing of the package.

PR Context

PR Checklist

• [x] PR has a meaningful title
  • Use the present tense and imperative mood when describing your changes
• [x] Summarized changes
• [x] Make sure all .h, .cpp, .cs, .ps1 and .psm1 files have the correct copyright header
• [x] This PR is ready to merge and is not Work in Progress.
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• Breaking changes
  • [x] None
  • OR
  • [ ] [Documentation needed]()
    • [ ] Issue filed:
• User-facing changes
  • [x] Not Applicable
  • OR
  • [ ] [Documentation needed]()
    • [ ] Issue filed:
• Testing - New and feature
  • [x] 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
  • [x] 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.