removing installation of non-existing wheel from tracing instructions (#42182)

Author: M-Hietala

sdk/ai/azure-ai-agents/README.md

@@ -1570,7 +1570,6 @@ You can add an Application Insights Azure resource to your Azure AI Foundry proj
 Make sure to install OpenTelemetry and the Azure SDK tracing plugin via
 
 ```bash
-pip install opentelemetry
 pip install azure-ai-agents azure-identity opentelemetry-sdk azure-core-tracing-opentelemetry
 ```