Update ZenModeAddBypassingApps to not binder call for every app

This update already happened for ZenModeAllBypassingApps to use the new single binder call to get all packages bypassing DND. This change uses that method for bypassing apps as well as collecting the set of all apps with a nonzero number of channels.

Bug: 368623163
Bug: 394614704
Test: ZenModeAddBypassingAppsPreferenceControllerTest, manual to confirm correct behavior
Flag: android.app.nm_binder_perf_get_apps_with_channels
Change-Id: I72a1edcb07d18f5707591a5341d7a7338c23f42b