ci: add OpenTelemetry tracing to chart integration test workflow

[wrn14897]

Summary

• Adds an otel-cicd-action job to the Helm chart integration test workflow that exports CI/CD trace data via OpenTelemetry
• Uses corentinmusard/otel-cicd-action@v4 to send workflow execution traces to the configured OTLP endpoint
• The job runs after test-helm-chart completes (regardless of success/failure) to ensure traces are always exported

Configuration

• OTLP_ENDPOINT and OTLP_HEADERS are read from repository secrets
• Service name is set to clickstack-helm-chart-integration-test

Ref: HDX-3503

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Latest commit: 072f53d

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