Change OTLP endpoint from gRPC to HTTP in montoring docs

[zhichli]

Migrated from microsoft/vscode-copilot-chat#5043
Original author: @JamesNK

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Updated the OTLP endpoint from gRPC to HTTP and modified the related configuration settings. This simplifies configuration.

The latest version of Aspire dashboard docker image includes support for OTLP/HTTP (protobuf or json)

cc @JamesNK

[Copilot]

Pull request overview

Updates the Copilot Chat OpenTelemetry “Quick Start” documentation to use Aspire Dashboard’s OTLP/HTTP ingestion rather than OTLP/gRPC, and adds a screenshot of traces in the Aspire Dashboard UI.

Changes:

• Switches the Aspire Dashboard port mapping and description from OTLP/gRPC (4317) to OTLP/HTTP (4318).
• Simplifies the VS Code settings snippet by relying on the default otlp-http exporter and default endpoint.
• Adds a screenshot illustrating what traces look like in Aspire Dashboard.

Show a summary per file

File	Description
extensions/copilot/docs/monitoring/agent_monitoring.md	Updates OTLP endpoint instructions (gRPC → HTTP), updates settings snippet, and embeds a new screenshot.
extensions/copilot/docs/media/trace-aspire-dashboard.png	Adds screenshot used by the updated monitoring docs.

Copilot's findings

Comments suppressed due to low confidence (1)

extensions/copilot/docs/monitoring/agent_monitoring.md:39

• Enabling OTel via github.copilot.chat.otel.* settings requires a window reload to take effect (per the setting descriptions). The quick start currently goes straight from editing settings to generating telemetry, which may fail unless the user reloads. Suggest adding an explicit “Reload Window” step or note after the JSON snippet.

### 2. Configure VS Code

Open **Settings** (`Ctrl+,`) and add:

```json
{
  "github.copilot.chat.otel.enabled": true,
  "github.copilot.chat.otel.captureContent": true
}

Note: You can also use environment variables instead of VS Code settings (see Configuration). Environment variables always take precedence.

</details>


- **Files reviewed:** 1/2 changed files
- **Comments generated:** 1