Revert "Merge pull request #15394 from morgoth/fix-automatic-maintaining-test-schema-for-sql-format"

This reverts commit 22e9a91189af2c4e6217a888e77f22a23d3247d1. See discussion on https://github.com/rails/rails/commit/22e9a91189af2c4e6217a888e77f22a23d3247d1 for details.

Conflicts:
	activerecord/CHANGELOG.md