Fix Camera app shortcut issue

Double click power button to launch Camera app on pixel phone is
blocked because the intent did not call collectExtraIntentKeys()
method before calling ActivityTaskManager.getService().startActivityXXX()
method. The class is actually used is LegacyActivityStarterInternalImpl.
I am also fixing ActivityStarterInternalImpl and CameraGestureHelper
just to be preventive.

Bug: 380802071
Test: manual
Flag: EXEMPT bugfix
Change-Id: I9f00ea2b7f623dd1702272b895362de22d4061bd