test: Disable TestBlockingWindow, our Teamcity agent does not support it yet.

[Eideren]

PR Details

Paraphrasing Xen2 on these tests failing:
https://teamcity.stride3d.net/buildConfiguration/Engine_Tests_WindowsSimple/25284?hideTestsFromDependencies=false&hideProblemsFromDependencies=false&expandBuildProblemsSection=true&expandBuildTestsSection=true&expandBuildDeploymentsSection=false

We currently run Teamcity as a service (using some system account). Since it runs in the background without real UI, it behaves differently.
This wasn't happening before because I was launching the teamcity agent as a specific user. I set it up in this user startup -- however it's annoying because I need to either login the user manually since it can't start without the user being logon (I also tried auto login, but I forgot if it worked or if login to init UI was necessary?).
On April 21st, I had to reinstall teamcity agent from scratch because it was broken, so I decided to put it as a service again.

Types of changes

• Docs change / refactoring / dependency upgrade
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• My change requires a change to the documentation.
• I have added tests to cover my changes.
• All new and existing tests passed.
• I have built and run the editor to try this change out.