* Add support for prompt truncation when using chatgpt if direct prompting is used
* Update tests for test token limit for prompt node
* Update warning message to be correct
* Minor cleanup
* Mark back to integration
* Update count_openai_tokens_messages to reflect changes shown in tiktoken
* Use mocking to avoid request call
* Fix test to make it comply with unit test requirements
* Move tests to respective invocation layers
* Moved fixture to one spot
