[RESTRICT AUTOMERGE] Revert "Don't abandon child sessions (1/n)"

Revert submission 16575908-dont_abandon_child_qt_dev

Reason for revert:  Reverting CVE-2021-39624 on qt-dev
Reverted Changes:
I4ede6b7a4:Persist destroyed staged sessions until they are c...
Ib0ba9f378:Don't abandon child sessions (1/n)

Change-Id: I7915e3f0ba6dd8430a9b938a518aeeeb4d6b1805
1 file changed