## Summary of the Pull Request
Upgrade the Windows SDK to 19041 by setting `WindowsTargetPlatformMinVersion` to 17763 and `WindowsTargetPlatformVersion` to 19041.
## PR Checklist
* [x] I work here
* [x] Tests added/passed
## Validation Steps Performed
General usage of the Windows Terminal application appears fine.
In #1164 we learned that our CI doesn't support WinRT testing. This made us all sad. Since that merged, we haven't really added any TerminalApp tests, because it's a little too hard. You'd have to uncomment the entire file, and if the list of types changed you'd have to manually update the sxs manifest and appxmanifest.
Since that was all insane, I created a new Terminal App unittesting project without those problems.
1. The project is not named *Unit*Test*, so the CI won't run it, but it will run locally.
2. The project will auto-generate its SxS manifest, using the work from #1987.
3. We'll use the SxS manifest from step 2 to generate an AppxManifest for running packaged tests.
* This is the start of me trying to enable local unittesting again
* We've got a new unittests project that isn't named *unit*test*
* We're manually generating the SxS manifest for it. B/C we need to use it at runtime, we need to manually combine it into one manifest file
* the runas:UAP thing still doesn't work. We'll investigate.
* This shockingly works
but I'm still stuck with:
```
Summary of Errors Outside of Tests:
Error: TAEF: [HRESULT: 0x80270254] Failed to create the test host process for
out of process test execution. (The
IApplicationActivationManager::ActivateApplication call failed while using a
default host. TAEF's ETW logs which are gathered with the /enableEtwLogging
switch should contain events from relevant providers that may help to diagnose
the failure.)
```
* Cleaning this all up for review.
Frankly just pushing to see if it'll work in CI
* Couple things I noticed in the diff from master
* Apply @dhowett-msft's suggestions from code review
