Warnings with relative paths not parsed

[dkt01]

In my project, some warning messages include an absolute path and others have a relative path. CompileResult only parses the warnings with an absolute path.

Example of a warning that is detected:

Checking line: /__w/app_cfh/app_cfh/prod/1A/plat_planning_nav_impl/planning_ros/src/control_conversions.cpp:86:13: warning: narrowing conversion of ‘(__gnu_cxx::__alloc_traits<std::allocator<double>, double>::value_type)message.planning_msgs::ControlImplJoint_<std::allocator<void> >::falling_effort_rate_limits.std::vector<double, std::allocator<double> >::operator[](i)’ from ‘__gnu_cxx::__alloc_traits<std::allocator<double>, double>::value_type’ {aka ‘double’} to ‘float’ [-Wnarrowing] with idx=0 true and true

Example of a warning that is not detected:

Checking line: prod/common/newmat/newmat5.cpp:494:69: warning: throw will always call terminate() [-Wterminate] with idx=-1 true and true

The file prod/common/newmat/newmat5.cpp is at absolute path /__w/app_cfh/app_cfh/prod/common/newmat/newmat5.cpp.

This appears to be because the absolute path prefix_dir is not at the beginning of the log lines (ref)

[JacobDomagala]

This was intentional and it was a way to ensure that given compile warning/error is from outside of repository.
For non-standard paths, user can set work_dir input variable (this is used for prefix_dir) and this was sufficient for my case (I build my projects entirely on github CI)

I will add a check for relative paths as well.