Also removes tests for the class.
Bug: T119253
Change-Id: I4c0d7187c2b847297dd0867faecba26185cfba37
Depends-On: Iccafbbdb06711463fee0f30a11326c7771df30e2
Provides the first step of adding and populating a new database field
for Echo oversight deployment. The new field is populated via a
maintenance script and Event::loadFromRow will accept both new and old
results. Everything will still run when the 2 now unused fields are
later dropped from the db.
Bug: 48059
Change-Id: I24d4b61a061f94ed9aaaa6087f33b2ab37f773cd
