[Angel] Delete duplicate classes for safety source data models

* They are unused and significantly diverged from the data model in
framework-s.
* Since it seems like the changes in framework-s will be submitted soon,
there's no need to have these duplicate classes anymore.

Test: not needed, just deleting unused files
Bug: 206752239
Change-Id: I198829d47732729de70ced15141b2c3397797420