make code coverage visible in Sonar Cloud

[epsig]

We have a code coverage build on TeamCity, but its results are not visible in Sonar Cloud.
The Kratos team can help us with this issue.
They use clang as compiler for the code coverage build.

[epsig]

Got this library compiling on windows with version 19 of clang ; the latest version of clang (21) gives build errors in the Google Test code.
On Linux (WSL) we got problems with the OpenMP code when using clang.

The code coverage build with clang does not work when the cwrapper is a dynamic ; made it a static lib. That makes coverage of the python tests not possible. Created an issue for that: see #301 .

For uploading the results, the file compile_commands.json is needed ; this is made by cmake when setting :
set(CMAKE_EXPORT_COMPILE_COMMANDS ON)

The build as part of the upload step must be without openmp ; disabled that for builds configured with :
SONARANALYSIS = ON