chore: remove old files (were used by old Jenkins setup)

sanitizer.suppressions/DO_NOT_EDIT_MOVED_TO_DRAGON

sanitizer.suppressions/lsan-doocs.supp

sanitizer.suppressions/lsan.supp

sanitizer.suppressions/tsan-doocs.supp

sanitizer.suppressions/tsan.supp

sanitizer.suppressions/ubsan.supp

scripts/cleanupArtifacts

scripts/findDependenciesDeep

scripts/generateBuildPlan

scripts/login_docker.sh

scripts/login_docker_installed.sh

valgrind.suppressions/bionic.supp

valgrind.suppressions/common.supp

valgrind.suppressions/tumbleweed.supp

valgrind.suppressions/xenial.supp

vars/analysis.groovy

vars/autojob.groovy

vars/buildAndDeploy.groovy

vars/helper.groovy

vars/nightly_manager.groovy