Rename TestLabels to AuraTestLabels

There are several cases on SFDC of people using our TestLabels
annotation outside of our test class. The SFDC version of TestLabels
should be used instead. This leads to issues like tests being marked
to be ignored via the IN_DEV label but are still being run.

@rev gtorres@
@bug W-2356743@
@P4CL:9216466@
Merging origin/tbliss/master-pending-testlabels-rename into master