Extend global-jjb C/cpp/cxx Sonar analysis implemented in jjb/lf-c-cpp.jobs.yaml and shell/cmake-sonar.sh to accept specification of (a) file(s) with code-coverage data.

This is done by specifying a property for the sonar scanner. The relevant properties (with their wildly divergent use of report*s* and Path*s*) are documented here: https://docs.sonarqube.org/latest/analysis/coverage/

sonar.cfamily.gcov.reportsPath
sonar.cfamily.llvm-cov.reportPath
sonar.cfamily.vscoveragexml.reportsPath
sonar.cfamily.bullseye.reportPath

Very closely related:

The old gerrit-cmake-sonar job defined in lf-c-cpp-jobs.yaml installs sonar scanner via wget from Sonar then runs it.

The new generic gerrit-sonar job defined in lf-ci-jobs.yaml invokes a Jenkins SonarCloud plugin.

Is it time to upgrade the cmake sonar job to use the plugin, or is there some torturous complication that I just have not hit yet?