dotnet-1.57.0

Changes:

• bbc66df .Net: Add Ollama ChatClient Extensions + UT (#12476)
• c07711e .Net: Update release versions and VectorData readme (#12487)
• 9b8f8e2 Python: Correct chat completion agent history truncation samples (#12474)
• ef912a9 .NET Agents - Switch all instance of "SendMessage" to "PublishMessage" (#12457)
• 4ab3d57 .Net: Adding retry to flakey test and switch to a different model (#12439)
• dfbc993 Python: Remove orchestration persona adaptation messages (#12446) [ #12294 ]
• eda707f .Net Agents - Fix AIContext instruction formatting for ChatCompletionAgent streaming invocation (#12444)

This list of changes was auto generated.