[release/5.0-rc2] Make newline escaping logic more robust #22602
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Fixes #22553
Description
We added some code in 5.0 to escape newlines in generated migrations. Unfortunately, this code was a little naive and missed some important cases. Several customers have hit this using RC1.
Customer Impact
This will impact many customers, as indicated by the multiple reports we already have against RC1.
How found
Customer reported on RC1.
Test coverage
We were lacking test coverage for the escaping. Better test coverage is included in this PR.
Regression?
Yes, from 3.1.
cc @Pilchie