sonarqube job: fix the git grep call of ./tools/find_sources.sh by fixing the gitlab-ci "detected dubious ownership in repository" problem

pkg-config: remove the cuda.pc and mpi.pc required dependencies, these files are not common and not installed usually
ChameleonPkgConfig.cmake: find the precise mpi .pc file to add in chameleon.pc required packages

cmake: if CHAMELEON_ENABLE_DOC is set to ON (OFF by default) then finding doxygen and emacs (with htmlize) are required. tex program is not necessary.

- fix a cppcheck option in analysis.sh.
- narrow the focus for sonarqube coverage (gpucublas, gpuhipblas)

Update build stage in order to use the new docker image and handle cuda and hip builds on plafrim using a guix environment

    * add regression test on the gflops
    * add -test jube files to test on minimalist cases
    * improve errors handling

ci: Temporary disable the mac build and test from the CI as the runners are no longer available for now

preliminary_checks must be standard job from a standard stage, not a builtin one, so that the trick with notest- branches for merge request works

At least one job must be run so that any merge request get a pipeline status (mandatory to accept the merge request)

Do not perform ci build/tests during merge_requests if the branch name starts with notest- (because we know the modifications have no impact on these tests)

Do not save all files generated for macosx (to avoid getting it in the sonarqube job) and add the junit report

Create a build and a test script for gitlab-ci (for readability) and prevent using scan-build when not necessary (not master i.e. no sonarqube) because it slows down the compilation step