Revert "Disable 2030-long-running-child on gcstress"

This reverts commit 871ce22a54f258e49aaf41c9ca2145afbc7451ea.

Reason for revert: The other CL in the topic fixes the underlying problems.

Change-Id: Ida7e3126bb5879a6515f2c288b982429c759c433
1 file changed