Add Entra identity platform code samples link to landing page

[Copilot]

Updated MS Entra ID branding references

Adds a link to Microsoft Entra's full code samples page in the "Samples" section of the MS Entra ID with ASP.NET Core landing page, per the Entra content refactor effort.

• Added bullet linking to Microsoft identity platform code samples after the existing sample entry
• Updated ms.date, added ai-usage: ai-assisted, reordered frontmatter alphabetically

Original prompt

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This section details on the original issue you should resolve

<issue_title>Entra Content Refactor: MS Entra ID with ASP.NET Core Landing page: Link to samples update</issue_title>
<issue_description>### Description

Contributes to #36277

At the bottom of this articles page in the "Samples" section, after the current sample listed, add a link to Entra's full sampls page with covers all scenarios:

Microsoft identity platform code samples: Microsoft Entra documentation's full code samples page, which covers covers common scenarios, including web apps and web APIs.

Page URL

https://learn.microsoft.com/en-us/aspnet/core/security/authentication/azure-active-directory/?view=aspnetcore-10.0

Content source URL

https://github.com/dotnet/AspNetCore.Docs/blob/main/aspnetcore/security/authentication/azure-active-directory/index.md

Document ID

2816eb27-7fc5-19e6-7f79-7e81a388647f

Platform Id

662e7d71-b50d-97a6-8f04-c5406d7c95bb

Article author

@wpickett

Metadata

• ID: 7bdae773-368b-a0c1-64d0-2a7b8c8fb134
• PlatformId: 662e7d71-b50d-97a6-8f04-c5406d7c95bb
• Service: aspnet-core
• Sub-service: security

Related Issues</issue_description>

<agent_instructions>Also read the parent Issue for this #32677</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes Entra Content Refactor: MS Entra ID with ASP.NET Core Landing page: Update references and branding #36917

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aspnetcore/security/authentication/azure-active-directory/index.md	Microsoft Entra ID with ASP.NET Core

[wadepickett]

Approved after making a few correctons.

[tdykstra]

Just one question / comment
Are we supposed to be removing ms.custom