[5.5] Add option to disable wrapping Migration in transaction #22757
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This was referenced Jan 29, 2019
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This PR provides the option to disable transactionally wrapping a migration.
In #15780 we added the ability to wrap migrations in transactions, where supported. This is awesome!
However, for exactly the same reasons expressed here: rails/rails#9483
I propose the identical solution merged here: rails/rails#9507
TL;DR
Postgres and SQL Server usually do support transactional DDL, but both also have cases where they do not. Adding this simple, passive option gives us the power to handle this when needed.