MDEV-19514 preparation: Remove innodb_change_buffering_debug=2
The setting innodb_change_buffering_debug=2 was supposed to inject a crash during change buffer merge. There is no public test for that functionality, and even if there were, it would be better to use DEBUG_SYNC to halt the thread that does change buffer merge, force a redo log flush from another thread, and finally kill the server externally.
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