Cannot run UWP tests with 3.6.2

[jnyrup]

Describe the bug

After upgrading from 3.6.1 to 3.6.4 I could no longer run tests from UWP.Specs in Visual Studio.

v3.6.2 was the first version that no longer worked for me.
I suspect it being related to #3949 as if I remove these three lines
https://github.com/microsoft/testfx/pull/3949/files#diff-9dfba7d4ed3c8c0e52817be015e3b388f7e1cd95cd6301c04684b604d720cb99R37-R39
or explicitly set <EnableMSTestV2CopyResources>false</EnableMSTestV2CopyResources> in my csproj the test is again runnable.

Steps To Reproduce

1. Clone https://github.com/fluentassertions/fluentassertions
2. Checkout c050f6bcaec68195f1d0dd0e44d233c6bbecf033
3. Open FluentAssertions.sln
4. Change to release mode.
5. Right click on UWP.Specs and select build (the project is excluded from the configuration manager)
6. See that Determining_caller_identity_should_not_throw_for_native_programs is runnable and succeeds.
7. Edit Tests\UWP.Specs\UWP.Specs.csproj to use 3.6.2
8. Build UWP.Specs again
9. See that Determining_caller_identity_should_not_throw_for_native_programs is no longer runnable.

Expected behavior

Determining_caller_identity_should_not_throw_for_native_programs should succeed

Actual behavior

Determining_caller_identity_should_not_throw_for_native_programs is not runnable from VS

Additional context

[Evangelink]

Perfect timing @jnyrup! I was about to start release of 3.7, including into that milestone so we fix and ship tomorrow.

[Evangelink]

Unrelated to your issue but as I am building I noticed:

MSTest is also supporting the new platform and xUnit and NUnit are on their way too (beta/previews for them).