competitions: Move common user result handling to SeasonSeriesBaseMixin
competitions: Move common user result handling to SeasonSeriesBaseMixin

matus-stehlik/roots,tbabej/roots,rtrembecky/roots,tbabej/roots,matus-stehlik/roots,rtrembecky/roots,matus-stehlik/roots,rtrembecky/roots,tbabej/roots