Add "still active member" as member type to data script

[dework-integration]

New member retention - Still Active member
Short description for the dashboard (client-facing copy):
Consistently active for 3 weeks after joining
Technical definition:
New members who joined, became active (week 0) and continued being active for the subsequent 3 weeks

https://docs.google.com/document/d/1I_fijM6-Oc7qd8QBSKL_tdmlDPlDFuSTjS-oU__oCYY/edit#heading=h.5y5k97t6x0q1

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[mehrdadmms]

This task is related to DAOlytics repo not bot repo. therefore I'm closing it.