<!-- Enter a brief description/summary of your PR here. What does it fix/what does it change/how was it tested (even manually, if necessary)? -->
## Summary of the Pull Request
This builds on top of #12707. As I understand it the primary motivation for using a git submodule instead of NuGet is just that it is too annoying to have to manage dozens of packages.config files and their corresponding import statements. Now that there is a single global nuget definition that is a nonissue and we can switch over.
This also updates to the latest version of WIL.
Now that the latest version of WIL is available it uses it to replace `winrt::resume_foreground` with `wil::resume_foreground`. See [492c01bb53) for a detailed explanation of the problems with `winrt::resume_foreground` and how WIL addresses them.
<!-- Other than the issue solved, is this relevant to any other issues/existing PRs? -->
## References
<!-- Please review the items on the PR checklist before submitting-->
## PR Checklist
* [ ] Closes#12776, Closes#12777
* [ ] CLA signed. If not, go over [here](https://cla.opensource.microsoft.com/microsoft/Terminal) and sign the CLA
* [ ] Tests added/passed
* [ ] Documentation updated. If checked, please file a pull request on [our docs repo](https://github.com/MicrosoftDocs/terminal) and link it here: #xxx
* [ ] Schema updated.
* [ ] I've discussed this with core contributors already. If not checked, I'm ready to accept this work might be rejected in favor of a different grand plan. Issue number where discussion took place: #xxx
<!-- Provide a more detailed description of the PR, other things fixed or any additional comments/features here -->
## Detailed Description of the Pull Request / Additional comments
<!-- Describe how you validated the behavior. Add automated tests wherever possible, but list manual validation steps taken as well -->
## Validation Steps Performed
Ran `git clean -fdx` to wipe my clone to be completely clean. Opened the solution in Visual Studio 2022 and build it. Used `razzle.cmd`, `b`, and `runut.cmd` to run the tests.
90c92850ea