The exact folder name for the list of MQ JAR files from the "third party file requirements" link for recent versions of DevTest is DEVTEST_HOME/lib/shared
In your instance, it is
"C:\Program Files\CA\DevTest\lib\shared\MQ jar"
(and the same location for all the other required JAR files for your MQ)
MQ JAR files are loaded at start time, so you will need to restart your DevTest applications (Workstation, VSE, Simulator, etc) after copying all the required MQ client JAR files into that location.