Remove unused bc25 grid layout prototypes.

Both the partitioned and stretched layouts are unused and require maintenance when adding new features to the prototype. Removing them to speed up the process

Flag: com.android.systemui.qs_ui_refactor
Bug: 331598956
Test: manually - using dual shade
Change-Id: I454d8828836b08aef0388127231d6f198e679682
9 files changed