[improvement](storage) For debugging problems: add session variable skip_storage_engine_merge to treat agg and unique data model as dup model #12973
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Mannual pick from master (#11952)
For debug purpose:
Add session variable skip_storage_engine_merge, when set to true, tables of aggregate key model and unique key model will be read as duplicate key model.
Add session variable skip_delete_predicate, when set to true, rows deleted with delete statement will be selected.
Proposed changes
Issue Number: close #xxx
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