uno fix: Validate Style.TargetType

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GitHub Issue (If applicable): closes #15512

Relevant pieces from WinUI:

https://github.com/microsoft/microsoft-ui-xaml/blob/a7cc34079da375f3380a09d1eb75870a700923c2/dxaml/xcp/core/core/elements/framework.cpp#L169-L188

PR Type

What kind of change does this PR introduce?

Please check if your PR fulfills the following requirements:

[ ] Docs have been added/updated which fit documentation template (for bug fixes / features)
[ ] Unit Tests and/or UI Tests for the changes have been added (for bug fixes / features) (if applicable)
[ ] Validated PR Screenshots Compare Test Run results.
[ ] Contains NO breaking changes
[ ] Associated with an issue (GitHub or internal) and uses the automatic close keywords.
[ ] Commits must be following the Conventional Commits specification.

Internal Issue (If applicable):

Feb 19 '24 18:02 Youssef1313

🤖 Your Docs stage site is ready! Visit it here: https://unodocsprstaging.z13.web.core.windows.net/pr-15537/index.html

Feb 19 '24 19:02 unodevops

🤖 Your WebAssembly Sample App stage site is ready! Visit it here: https://unowasmprstaging.z20.web.core.windows.net/pr-15537/index.html

Feb 19 '24 20:02 unodevops

🤖 Your Docs stage site is ready! Visit it here: https://unodocsprstaging.z13.web.core.windows.net/pr-15537/index.html

Feb 20 '24 11:02 unodevops

🤖 Your Docs stage site is ready! Visit it here: https://unodocsprstaging.z13.web.core.windows.net/pr-15537/index.html

Feb 20 '24 15:02 unodevops

🤖 Your WebAssembly Sample App stage site is ready! Visit it here: https://unowasmprstaging.z20.web.core.windows.net/pr-15537/index.html

Feb 20 '24 16:02 unodevops

🤖 Your WebAssembly Sample App stage site is ready! Visit it here: https://unowasmprstaging.z20.web.core.windows.net/pr-15537/index.html

Feb 21 '24 23:02 unodevops

🤖 Your Docs stage site is ready! Visit it here: https://unodocsprstaging.z13.web.core.windows.net/pr-15537/index.html

Feb 21 '24 23:02 unodevops

/azp run

May 07 '24 13:05 jeromelaban

Azure Pipelines successfully started running 2 pipeline(s).

May 07 '24 13:05 azure-pipelines[bot]

🤖 Your Docs stage site is ready! Visit it here: https://unodocsprstaging.z13.web.core.windows.net/pr-15537/index.html

May 07 '24 13:05 unodevops

@Youssef1313 it seems that this PR fails on some steps.

May 07 '24 13:05 jeromelaban

🤖 Your WebAssembly Sample App stage site is ready! Visit it here: https://unowasmprstaging.z20.web.core.windows.net/pr-15537/index.html

May 07 '24 14:05 unodevops

@Youssef1313 it looks like the changes are failing tests.

May 08 '24 12:05 jeromelaban