Obsolete UsernamePasswordCredentialOptions (Azure#48669)

Author: christothes

sdk/identity/Azure.Identity/api/Azure.Identity.net8.0.cs

@@ -438,6 +438,8 @@ public UsernamePasswordCredential(string username, string password, string tenan
         public override Azure.Core.AccessToken GetToken(Azure.Core.TokenRequestContext requestContext, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
         public override System.Threading.Tasks.ValueTask<Azure.Core.AccessToken> GetTokenAsync(Azure.Core.TokenRequestContext requestContext, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
     }
+    [System.ComponentModel.EditorBrowsableAttribute(System.ComponentModel.EditorBrowsableState.Never)]
+    [System.ObsoleteAttribute("This credential is deprecated because it doesn't support multifactor authentication (MFA). See https://aka.ms/azsdk/identity/mfa for details about MFA enforcement for Microsoft Entra ID and migration guidance.")]
     public partial class UsernamePasswordCredentialOptions : Azure.Identity.TokenCredentialOptions
     {
         public UsernamePasswordCredentialOptions() { }

sdk/identity/Azure.Identity/api/Azure.Identity.netstandard2.0.cs

@@ -435,6 +435,8 @@ public UsernamePasswordCredential(string username, string password, string tenan
         public override Azure.Core.AccessToken GetToken(Azure.Core.TokenRequestContext requestContext, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
         public override System.Threading.Tasks.ValueTask<Azure.Core.AccessToken> GetTokenAsync(Azure.Core.TokenRequestContext requestContext, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
     }
+    [System.ComponentModel.EditorBrowsableAttribute(System.ComponentModel.EditorBrowsableState.Never)]
+    [System.ObsoleteAttribute("This credential is deprecated because it doesn't support multifactor authentication (MFA). See https://aka.ms/azsdk/identity/mfa for details about MFA enforcement for Microsoft Entra ID and migration guidance.")]
     public partial class UsernamePasswordCredentialOptions : Azure.Identity.TokenCredentialOptions
     {
         public UsernamePasswordCredentialOptions() { }

sdk/identity/Azure.Identity/src/Credentials/UsernamePasswordCredentialOptions.cs

@@ -1,13 +1,17 @@
 // Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT License.
 
+using System;
 using System.Collections.Generic;
+using System.ComponentModel;
 
 namespace Azure.Identity
 {
     /// <summary>
     /// Options to configure the <see cref="UsernamePasswordCredential"/>.
     /// </summary>
+    [EditorBrowsable(EditorBrowsableState.Never)]
+    [Obsolete("This credential is deprecated because it doesn't support multifactor authentication (MFA). See https://aka.ms/azsdk/identity/mfa for details about MFA enforcement for Microsoft Entra ID and migration guidance.")]
     public class UsernamePasswordCredentialOptions : TokenCredentialOptions, ISupportsTokenCachePersistenceOptions, ISupportsDisableInstanceDiscovery, ISupportsAdditionallyAllowedTenants
     {
         /// <summary>