Merged PR 20915: Add PlatformAutomaticAppSignInManager winrt API

A new winrt API is added for providing information about the current Windows policy for automatic app sign in.

Feature [2626757](https://identitydivision.visualstudio.com/Engineering/_workitems/edit/2626757): [DOC] Release updated MSDN doc

[Here](https://microsoft.sharepoint.com/:w:/r/teams/OSG_DevX/Approved%20Specs/AutomaticAppSignInPolicy.docx?d=w7a199b5d00f942b4b12c0b99f0c3baff&csf=1&web=1&e=7zh4jq) is the API spec:

Author: MSamWils

windows.system.profile/platformautomaticappsigninmanager.md

@@ -0,0 +1,21 @@
+---
+-api-id: T:Windows.System.Profile.PlatformAutomaticAppSignInManager
+-api-type: winrt class
+---
+
+<!-- Class syntax.
+public static class PlatformAutomaticAppSignInManager 
+-->
+
+# Windows.System.Profile.PlatformAutomaticAppSignInManager
+
+## -description
+Provides information about the current Windows policy for automatic app sign in.
+
+## -remarks
+> [!IMPORTANT]
+> This class is intended for use by first-party applications.
+
+## -see-also
+
+## -examples

windows.system.profile/platformautomaticappsigninmanager_policy.md

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+---
+-api-id: P:Windows.System.Profile.PlatformAutomaticAppSignInManager.Policy
+-api-type: winrt property
+---
+
+<!-- Property syntax.
+public static Windows.System.Profile.PlatformAutomaticAppSignInPolicy Policy { get; }
+-->
+
+# Windows.System.Profile.PlatformAutomaticAppSignInManager.Policy
+
+## -description
+The Windows policy for automatic app sign in.
+
+## -property-value
+
+## -remarks
+> [!IMPORTANT]
+> This method is intended for use by first-party applications.
+
+## -see-also
+[PlatformAutomaticAppSignInPolicy](platformautomaticappsigninpolicy_platformautomaticappsigninpolicy.md)
+
+## -examples

windows.system.profile/platformautomaticappsigninpolicy_platformautomaticappsigninpolicy.md

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+---
+-api-id: T:Windows.System.Profile.PlatformAutomaticAppSignInPolicy
+-api-type: winrt enum
+---
+
+<!--
+public enum PlatformAutomaticAppSignInPolicy
+-->
+
+# Windows.System.Profile.PlatformAutomaticAppSignInPolicy
+
+## -description
+Defines state that specify the current stage for automatic app sign in.
+
+## -enum-fields
+
+### -field Unknown: 0
+
+This policy cannot be evaluated
+
+### -field PermissionRequired: 1
+
+Do not sign in automatically
+
+### -field AlwaysAllowed: 2
+
+Sign in automatically
+
+## -remarks
+> [!IMPORTANT]
+> This enum is intended for use by first-party applications.
+
+## -see-also
+[Policy](platformautomaticappsigninmanager_policy.md)