Add OTF-CPT for latest iimpi and gompi+Clang toolchains

When installing the gompi+Clang version locally, EB is not able to find the easyconfig for Clang probably because it isn't included in the release of the installed EB version. However, the specified Clang module is available and the installation works fine.

== resolving dependencies ...
ERROR: Missing dependencies: Clang/18.1.8-GCCcore-13.2.0-CUDA-12.4.0 (no easyconfig file found in robot search path)

Continue to install with conflict? [yes/NO]: yes

I hope the robot path is set properly for the automated installation process.