Bug 1646588 - Add esr78 support. r=aki

.cron.yml

taskcluster/ci/build/windows-mingw.yml

taskcluster/ci/config.yml

taskcluster/ci/cron-bouncer-check/kind.yml

taskcluster/ci/l10n-bump/kind.yml

taskcluster/ci/release-balrog-scheduling/kind.yml

taskcluster/ci/release-bouncer-aliases/kind.yml

taskcluster/ci/release-bouncer-sub/kind.yml

taskcluster/ci/release-snap-push/kind.yml

taskcluster/ci/release-update-verify-config-next/kind.yml

taskcluster/ci/release-update-verify-config/kind.yml

taskcluster/ci/release-update-verify-next/kind.yml

taskcluster/ci/repackage-l10n/kind.yml

taskcluster/ci/repackage/kind.yml

taskcluster/docs/parameters.rst

taskcluster/taskgraph/decision.py

taskcluster/taskgraph/target_tasks.py

taskcluster/taskgraph/transforms/update_verify_config.py

taskcluster/taskgraph/util/attributes.py

taskcluster/taskgraph/util/scriptworker.py