Revert Targeted Messages support (PR #195 and #222)

[ShanmathiMayuramKrithivasan]

Revert Targeted Messages support (PR #195 and #222)

This reverts the following PRs:

• PR #222: Fix App Send Targeted Messages (5c40750)
• PR #195: Add support for Targeted Messages (98502aa)

Removes the isTargeted parameter from all Send/Reply APIs.

[Copilot]

Pull request overview

This PR cleanly reverts the targeted messages support that was introduced in PRs #195 and #222. It removes the isTargeted boolean parameter from all Send/Reply APIs across the codebase, eliminating the ability to send messages privately to specific recipients within a conversation.

Changes:

• Removed isTargeted parameter from all Send, Reply, Update, Create, and Delete methods across the API surface
• Removed conditional logic for appending isTargetedActivity=true query parameter to API URLs
• Removed validation logic that required activity.Recipient for targeted messages
• Removed test coverage for targeted message scenarios

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
Libraries/Microsoft.Teams.Api/Clients/ActivityClient.cs	Removed isTargeted parameter from CreateAsync, UpdateAsync, ReplyAsync, and DeleteAsync methods; removed query parameter logic
Tests/Microsoft.Teams.Api.Tests/Clients/ActivityClientTests.cs	Removed four test methods for targeted message scenarios
Libraries/Microsoft.Teams.Apps/Plugins/SenderPlugin.cs	Removed interface method overloads with isTargeted parameter
Libraries/Microsoft.Teams.Plugins/Microsoft.Teams.Plugins.AspNetCore/AspNetCorePlugin.cs	Removed Send method overloads with isTargeted parameter and updated all call sites
Libraries/Microsoft.Teams.Apps/App.cs	Removed isTargeted parameter from Send methods, removed recipient validation, removed User field assignment in ConversationReference
Libraries/Microsoft.Teams.Apps/Contexts/Context.Send.cs	Removed isTargeted parameter from all Send/Reply methods in interface and implementation, removed related documentation
Libraries/Microsoft.Teams.Apps/Contexts/Context.Client.cs	Removed isTargeted parameter from Client class methods and removed related documentation
Libraries/Microsoft.Teams.Apps/Contexts/Context.SignIn.cs	Removed explicit isTargeted: false arguments from Send calls
Libraries/Microsoft.Teams.Apps.Testing/Plugins/TestPlugin.cs	Removed Send method overloads with isTargeted parameter

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