Move Overview-specific flags to a separate aconfig file

This is to keep the main launcher aconfig file more organized and easier to read and aligned with gantry namespace.

Bug: 349534860
Change-Id: Ib21fbac38ed0564fa481fce3a2da9a9b8c1a7139
Flag: EXEMPT - moving flags to another file
Test: EXEMPT - moving flags to another file
2 files changed