Why are these changes needed?

There are some tests which are missing async def and await before calling async function
There are 6 warning like this:
RuntimeWarning: coroutine 'some_function' was never awaited some_function(credentials_from_test_param)
in Github Action

Related issue number

Closes #610

Checks

• I've included any doc changes needed for https://docs.ag2.ai/. See https://docs.ag2.ai/docs/contributor-guide/documentation to build and test documentation locally.
• I've added tests (if relevant) corresponding to the changes introduced in this PR.
• I've made sure all auto checks have passed.