DevHome tasks need to have a better dependency model

[dhoehna]

Dev Home version

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Windows build number

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Other software

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Steps to reproduce the bug

TODO found at DevHome.SetupFlow.LoadingViewModel.cs

Expected result

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Actual result

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Included System Information

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Included Extensions Information

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[dhoehna]

This is not a bug but an issue. If the number of setup pages increases or dependency rules are introduced, DevHome needs a robust way of handling the dependencies.