fix: Remove Uno.UI.Reference from Skia slnf

[MartinZikmund]

GitHub Issue (If applicable): closes #

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What kind of change does this PR introduce?

What is the current behavior?

What is the new behavior?

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Internal Issue (If applicable):

[unodevops]

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[Youssef1313]

This is supposed to be problematic. Have you tried a local build for the whole solution inside Visual Studio?

[Youssef1313]

Oh, it's not yet required on current master, but it will be required by the way #18216 is doing the packaging.

[MartinZikmund]

Then I guess we will need to add Uno.Reference and Uno.Foundation.Reference as well, otherwise VS complains about missing types

[jeromelaban]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 2 pipeline(s).

[unodevops]

🤖 Your Docs stage site is ready! Visit it here: https://unodocsprstaging.z13.web.core.windows.net/pr-18535/index.html

[unodevops]

🤖 Your WebAssembly Sample App stage site is ready! Visit it here: https://unowasmprstaging.z20.web.core.windows.net/pr-18535/index.html

[unodevops]

⚠️⚠️ The build 147781 has failed on Uno.UI - CI.