[CI] Move platform specific test report titles to python
This patch moves the platform specific test report titles to the
generate_test_report_github.py script. This means that the functions in
the monolithic-* scripts are exactly the same now and can be moved into
a separate script that can be shared between the two scripts.
Reviewers: DavidSpickett, cmtice, lnihlen, dschuff, Keenuts, gburgessiv
Reviewed By: DavidSpickett
Pull Request: https://github.com/llvm/llvm-project/pull/152198
