Tasks cleanup & admin troubleshooting page

frontend/src/metabase/admin/routes.jsx

frontend/src/metabase/admin/tasks/containers/JobInfoApp.jsx

.../src/metabase/admin/tasks/containers/JobTriggersModal.jsx

...rc/metabase/admin/tasks/containers/TroubleshootingApp.jsx

frontend/src/metabase/admin/tasks/jobInfo.js

frontend/src/metabase/services.js

resources/quartz.properties

src/metabase/api/task.clj

src/metabase/models/task_history.clj

src/metabase/task.clj

src/metabase/task/follow_up_emails.clj

src/metabase/task/send_anonymous_stats.clj

src/metabase/task/send_pulses.clj

src/metabase/task/sync_databases.clj

src/metabase/task/task_history_cleanup.clj

src/metabase/task/upgrade_checks.clj

test/metabase/test/util.clj