Enable telemetry for HTTP mode

[srnagar]

What does this PR do?

This pull request refactors and enhances the configuration of Azure Monitor (Application Insights) telemetry exporters in the OpenTelemetryExtensions class. The changes allow support for multiple exporters, improve environment variable handling, and simplify telemetry enablement logic.

Azure Monitor Exporter Configuration Improvements:

• Refactored to support multiple Azure Monitor exporters by collecting connection strings from both user-provided and Microsoft-provided sources, and introduced a new method ConfigureMultipleAzureMonitorExporters to register each exporter for logging, metrics, and tracing. [1] [2]
• Changed the default Application Insights connection string constant name from DefaultAppInsights to DefaultAppInsightsConnectionString for clarity.

Telemetry Enablement Logic Simplification:

• Simplified the logic for enabling telemetry by removing the check for the transport type and basing the decision solely on the AZURE_MCP_COLLECT_TELEMETRY environment variable.

Environment Variable Handling:

• Removed redundant fallback logic for the Application Insights connection string, deferring the selection and prioritization to the new exporter configuration logic.

GitHub issue number?

https://github.com/microsoft/mcp-pr/issues/148

Pre-merge Checklist

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[Copilot]

Pull Request Overview

This PR enables telemetry collection for HTTP transport mode by refactoring the Azure Monitor exporter configuration to support multiple exporters and simplifying the telemetry enablement logic.

Key changes:

• Removed the transport-specific telemetry check, allowing telemetry to be collected regardless of transport mode (stdio or HTTP)
• Introduced support for multiple Azure Monitor exporters with separate user-provided and Microsoft telemetry collection streams
• Added a new environment variable AZURE_MCP_COLLECT_TELEMETRY_MICROSOFT to control Microsoft-specific telemetry collection

[vukelich]

Small comments.

[vukelich]

Minor comments. Do or skip.