Cleaning up some build configurations

> Removing Launcher3Go-without-quickstep
> Removing src_ui_overrides to src_no_quickstep
> Removing unnecessary code swpa for GO builds

Bug: 330920490
Flag: None
Test: Presubmit, everything builds
Change-Id: I5746dbc7c5a37c1d99d78b55bf2a6adce1a711c9