Changed plots to histogram with kde, removed generated images from artifacts, and updated baselines to a stable set

Signed-off-by: Vedant <[email protected]>

Author: vrnimje

.jenkins/lsu-perftests/batch.sh

@@ -17,7 +17,6 @@ status_computation_and_artifacts_storage() {
     # Copy the testing directory for saving as an artifact
     cp -r ${build_dir}/Testing ${src_dir}/${configuration_name}-Testing
     cp -r ${build_dir}/*.json ${src_dir}/${configuration_name}-reports
-    cp -r ${build_dir}/*.png ${src_dir}/${configuration_name}-reports
 
     echo "${ctest_status}" > "jenkins-hpx-${configuration_name}-ctest-status.txt"