I've tried to do this in #95396

But it has a problem - in case of pipeline has not been created, the snapshot still can exists, which will not protect storage from deletion, and later it can use it from IMergeTreeDataPart dtors

Refs: #95577 (comment)

History:

• Reset query metadata cache before finalizing pipeline in BlockIO::onFinish #97488
• Fix heap-use-after-free in MergeTreeReadTask::createReaders #99483
• ...