ASDataController Disable Flushing Experiment

[AmbarSeptian]

In Texture 2.8 the code that makes the collection / table deadlock will be be removed,

NSTimeInterval transactionQueueFlushDuration = 0.0f;
     {
       ASDN::ScopeTimer t(transactionQueueFlushDuration);
       dispatch_group_wait(_editingTransactionGroup, DISPATCH_TIME_FOREVER);
     }

PR Texture: TextureGroup#1564

But the Texture team creates a flag experiment before completely remove the code and impact to all collection / table. For safety we follow the approach in Texture 2.8 by creating our flag, so we can configure it manually for each collection/table