Always set EXTRA_IS_SETUP_FLOW when starting activities

Some activities behave differently if launched during setup (e.g. https://cs.android.com/android/platform/superproject/main/+/main:packages/apps/Settings/src/com/android/settings/biometrics/BiometricUtils.java;l=203;drc=7f8197da822dea3ce92d3aedb61715d372d7a8e1 https://cs.android.com/android/platform/superproject/main/+/main:external/setupcompat/main/java/com/google/android/setupcompat/util/WizardManagerHelper.java;l=243;drc=d4035b6eb1192f71af7adae47bf17d22c7356fa1)
This change defaults to using the setup flow variant of all launched activities (if applicable)

Change-Id: I0448f2ec5b2789a094d69b1614596d96260edbf5