- Removed `TagHelperFactsServiceInternal` since we had no way of retrieving the internal Workspace service given the exposed public API. Not to mention I think the `TagHelperFactsService` made more sense as a MEF service anyhow.
- Moved `TagHelperFactsServiceInternal` tests to `Microsoft.VisualStudio.Editor.Razor.Test` project and changed them to utilize the non-"internal" version.
- Updated completion service API to rely on non-`TagHelperFactsServiceInternal` pieces.
#2004
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