Add instrumentation to Ollama integration to support observability for chat and embedding models.

Demo app for manual verification: https://github.com/ThomasVitale/llm-apps-java-spring-ai/tree/main/10-observability/observability-models-ollama

Comment From: markpollack

merged in 10e1e13fa204b2f634ee874fcee2360f94f18185

made some changes to run multiple Ollama ITs reusing the same container, see notes in BaseOllamaIT