Wapproj packaging issue - Payload file does not exist
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Description
### Issue Description
This bug report is a copy of this issue: https://github.com/microsoft/microsoft-ui-xaml/issues/2859, and it's related to this issue: https://dev.azure.com/devdiv/DevDiv/_workitems/edit/1157568
Unable to package my UWP app when using WinUI 2.5 prerelease. These errors show up:

### Steps to Reproduce
Steps to reproduce the behavior:
1. Download this solution: https://1drv.ms/u/s!Ar4RhL72OhUDzrwOz9woYwhKfeDxjQ?e=m6A2qP
2. Launch the `.sln` file in VS2019
3. Rebuild solution
3. Right click on `WapProjTemplate1` > Publish > Create app package
4. Select Microsoft Store as the distribution method
5. Ensure the configuration looks like this:

6. Click create
7. Packaging error occurs in a few seconds.
### Expected Behavior
Build completes
### Actual Behavior
Build fails with these errors:

### Analysis
Steve Kirbach from Microsoft found a workaround here: https://github.com/microsoft/microsoft-ui-xaml/issues/2859#issuecomment-659007800
### Versions & Configurations
### Attach a binlog
https://1drv.ms/u/s!Ar4RhL72OhUDzrwViE0iqaUQU5fTuA?e=cHLuRC
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