Entra Id - NLog update

[rajkumar-rangaraj]

No description provided.

[Copilot]

Pull request overview

This PR adds support for Azure Active Directory (Entra ID) authentication to the NLog target by introducing a new Credential property that accepts a TokenCredential for AAD authentication with Azure Monitor.

Key changes:

• Added Credential property to ApplicationInsightsTarget for AAD token-based authentication
• Integrated OpenTelemetry resource configuration with distribution name tracking
• Updated documentation and examples to demonstrate the new AAD authentication approach

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
LOGGING/src/NLogTarget/ApplicationInsightsTarget.cs	Added Credential property, integrated credential configuration in InitializeTarget, and added OpenTelemetry resource attributes
LOGGING/test/NLogTarget.Tests/NLogTargetTests.cs	Added test for Credential property getter/setter and MockTokenCredential helper class
examples/NLogConsoleApp/Program.cs	Updated commented example code to demonstrate new credential-based AAD authentication approach
LOGGING/README.md	Updated AAD authentication documentation with new programmatic configuration example
.publicApi/Microsoft.ApplicationInsights.NLogTarget.dll/Stable/PublicAPI.Unshipped.txt	Added public API surface for new Credential property

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