Filtered changelog from rc1

ab5f770bf Explicitly shutdown logging in tasks so concurrent.futures can be used (#13057)
ea3d42a3b Make AirflowJsonEncoder uses Flask's JSONEncoder as a base  (#13050)
4d3300c1d Refactor plugins command output using AirflowConsole (#13036)
6bf9acb90 Fix import from core to mysql provider in mysql example DAG (#13060)