Support continue final message (#2733)
* feat: support continue_final_message param in chat request
* feat: add test for continue final message
* fix: bump openapi docs
* fix: remove continue_final_message chat request param
* fix: remove unneeded launcher args in continue test
* fix: bump test output
* fix: remove accidentally included guideline from rebase
* fix: remove guideline tests
* fix: adjust continuation tests expected text
* fix: replace expected output for continue test
