Default enable merge_requests_merge_data_dual_write

Sincheol (David) Kimrequested to merge
default-enable-merge_requests_merge_data_dual_write into master

What does this MR do and why?

Default enable merge_requests_merge_data_dual_write as it has been enabled globally for about a day and showing no issues. #577053 (comment 2928698022)

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