Show the schema version number as the primary label schema label

[jlrobins]

Summary of Changes

• Show the schema version number as the primary label schema label in the description in the schema treeview items. The version number is more informative than the unique-within-this-registry schema id.

Any additional details or context that should be provided?

Pull request checklist

Please check if your PR fulfills the following (if applicable):

Tests

• Added new
• Updated existing
• Deleted existing

Other

• Does anything in this PR need to be mentioned in the user-facing CHANGELOG or README?
• Have you validated this change locally by packaging and installing the extension .vsix file?

  gulp clicktest