Update bot-message-extension sample with teams sdk 2.1

[AjayJ12-MSFT]

No description provided.

[Copilot]

Pull request overview

Updates the TeamsSDK bot-message-extension (.NET) sample to use the Microsoft Teams SDK 2.1 surface area, including new message extension APIs and Azure AD configuration keys.

Changes:

• Migrates the bot wiring from the older Teams ASP.NET Core plugin to Microsoft.Teams.Apps / Microsoft.Teams.Cards APIs.
• Updates configuration from Teams:* settings to AzureAd:* (including client credential array format).
• Adjusts local launch settings to reflect the new AzureAd environment variable names.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
samples/TeamsSDK/bot-message-extensions/dotnet/bot-message-extensions/Program.cs	Refactors message extension handlers and attachment/response creation to the Teams SDK 2.1 API surface.
samples/TeamsSDK/bot-message-extensions/dotnet/bot-message-extensions/BotMessageExtensions.csproj	Replaces old package dependency with Teams SDK 2.1 packages.
samples/TeamsSDK/bot-message-extensions/dotnet/bot-message-extensions/appsettings.json	Renames/configures auth settings under AzureAd with client credential array.
samples/TeamsSDK/bot-message-extensions/dotnet/bot-message-extensions/Properties/launchSettings.EXAMPLE.json	Updates env var names and adds a flag that bypasses auth for local runs.

Suppressed comments (1)

samples/TeamsSDK/bot-message-extensions/dotnet/bot-message-extensions/Program.cs:138

• CreateSearchResultAttachment builds a ThumbnailCard payload with only title/text, so users can't open the Wikipedia article from the result. Add an OpenUrl button (and accept the URL as an argument) so selecting a result stays useful.

static TeamsAttachment CreateSearchResultAttachment(string title, string text)
{
    return TeamsAttachment.CreateBuilder()
        .WithContent(new { title, text })
        .WithContentType(AttachmentContentTypes.ThumbnailCard)

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[Harikrishnan-MSFT]

Approved!!

[AjayJ12-MSFT]

Build Successful: https://github.com/OfficeDev/Microsoft-Teams-Samples/actions/runs/33471645502