Merge pull request #6375 from jtattermusch/cleanup_jenkins_directory

tools/jenkins/README.md

tools/jenkins/run_fuzzer.sh

tools/run_tests/artifact_targets.py

tools/run_tests/distribtest_targets.py

tools/run_tests/dockerize/build_and_run_docker.sh

tools/run_tests/dockerize/build_docker_and_run_tests.sh

tools/run_tests/dockerize/build_interop_image.sh

tools/run_tests/dockerize/build_interop_stress_image.sh

tools/run_tests/dockerize/docker_run.sh

tools/run_tests/dockerize/docker_run_tests.sh

tools/run_tests/package_targets.py

tools/run_tests/run_interop_tests.py

tools/run_tests/run_stress_tests.py

tools/run_tests/run_tests.py

tools/run_tests/stress_test/configs/asan.json

tools/run_tests/stress_test/configs/csharp.json

tools/run_tests/stress_test/configs/go.json

tools/run_tests/stress_test/configs/java.json

tools/run_tests/stress_test/configs/node-cxx.json

tools/run_tests/stress_test/configs/node.json