Ensure that functional tests are green for Agent versions when running against AM6

For the AM6 release we are checking the functional tests to ensure that there are no genuine failures with latest two versions of c-agent and java-agent. We are also fixing functional tests whilst doing this.
https://docs.google.com/spreadsheets/d/1Jfq_ZQ2vLNx6cBfL6bS9KMr4xy7T4Y0K50UeR_w0Gh0/edit?ts=5abb66b7#gid=0