Use CreateFile2FromApp if available (dotnet/coreclr#13410)

Use CreateFile2FromApp if available (dotnet/coreclr#13410)

* Use CreateFile2FromApp if available

This is needed for F5 UAP brokering scenarios.

Remove check for handle type. Overzealous, doesn't apply to UAP scenarios.

* Address feedback

- Use CreateFile2 if Win8 or higher
- Always use CreateFile2FromApp if Appx
- Make DisableMediaInsertionPrompt a struct
- Push CreateFile2FromApp down to avoid JIT

* More feedback

Always use FromApp for WinRT.

* Conditionalize IsWindows8OrAbove check

* Always use FromApp if in AppX

* Address more feedback

- Fix Unix build by moving LoadString to shared
- Break out CREATEFILE2 struct
- Condition CreateFile2FromApp usage

* Move include

Commit migrated from https://github.com/dotnet/coreclr/commit/41a2b788cb77668d397e372df40c5215bf61bfa7