Revert "Deprecate Activity#isChild/getParent"

This reverts commit a8a2013b89b79e9e9252adfdd53538f392164fcb.

Reason for revert: revert per release team requirement to wait until
24Q3 becomes ‘next’

Change-Id: I0b11e6f02ee60cbdfadd5d0b1ef32cb58ea18344
2 files changed