Clean up a bunch of launched low-risk VDM flags

All have been in nextfood for >8 weeks

 - stream_permissions
 - express_metrics
 - intercept_intents_before_applying_policy
 - metrics_collection
 - virtual_display_multi_window_mode_support
 - intent_interception_action_matching_fix

Bug: n/a
Test: presubmit
Flag: EXEMPT cleanup
Change-Id: I61475db8a45e0aeb54fee2f7c301524b5d24cce2