Merge remote-tracking branch 'tor-github/pr/1480'

changes/ticket32196

src/core/or/circuitmux.c

src/core/or/circuitmux.h

src/core/or/circuitmux_ewma.c

src/core/or/circuitmux_ewma.h

src/core/or/destroy_cell_queue_st.h

src/test/fakecircs.c

src/test/fakecircs.h

src/test/include.am

src/test/test.c

src/test/test.h

src/test/test_circuitmux.c

src/test/test_circuitmux_ewma.c

src/test/test_circuitpadding.c

src/test/test_relay.c