Make manifest type support host specific and improve tests

[millerds]

Thank you for your pull request. Please provide the following information.

---

1. Do these changes impact User Experience? (e.g., how the user interacts with Yo Office and/or the files and folders the user sees in the project that Yo Office creates)

   • [x] Yes
   • [ ] No

Manifest type question is specific to host

2. Do these changes impact documentation? (e.g., a tutorial on https://learn.microsoft.com/en-us/office/dev/add-ins/overview/office-add-ins)

   • [ ] Yes
   • [x] No

Documentation not written yet, but this should be considered when it is.

3. Validation/testing performed:

   Manual project creation and automated tests

4. Platforms tested:

   • [x] Windows
   • [ ] Mac