Launch activities in another task if the metadata is set.

Add FLAG_ACTIVITY_NEW_TASK to the intent if META_DATA_LAUNCH_NEW_TASK is
set to true to make it launch a separate task.

Bug: 197702494
Bug: 197700978
Bug: 197702789
Test: Set this metadata to true and make sure this page is launched in another task.
Change-Id: I3b4e5745e940a3db5db6be51e17a9c505915e3c0