Remove unused phonelog

relies on https://github.com/dimagi/phonelog/pull/23

this is built on top of https://github.com/dimagi/commcare-hq/pull/3010

https://github.com/dimagi/commcare-hq/pull/3010 just removes the rewritten reports. while https://github.com/dimagi/commcare-hq/pull/3011 removes reports that weren't written but seem to be unused