[CODE HEALTH] turn on the cppcoreguidelines-init-variables check and fix warnings#3751

marcalff merged 4 commits intoopen-telemetry:mainopen-telemetry/opentelemetry-cpp:mainfrom

dbarker:code_health_check_and_fix_uninitialized_variablesdbarker/opentelemetry-cpp:code_health_check_and_fix_uninitialized_variablesCopy head branch name to clipboard