Finish deprecation of Microsoft.Extensions.AI.Ollama #6631
Description
Alongside the 9.5.0 release of MEAI, we marked the Microsoft.Extensions.AI.Ollama package as deprecated, directing folks to the OllamaSharp package that has direct MEAI integration.
To finish the deprecation of this package, we can proceed with removing it from our codebase and update any remaining references to it from within the tree or our documentation.