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Remove old BackfillProjectsWithCoverage migration for CI decomposition

Dylan Griffith requested to merge 342856-remove-background-migration-that-wont-work-with-ci-decomposed-db into master

What does this MR do and why?

When we split our database into main and CI there were still some old legacy migrations that would not technically work if the database was decomposed. We want to remove or fix those now so that we can eventually have the database decomposed by default for all installations. Any migrations before 15.X that don't change the schema can be no-oped as we assume that must already have run before upgrading to this point because we require you to upgrade to the last minor release before doing a major upgrade.

This migration was added in !69115 (merged) which was merged in %14.3 so this should be already run before upgrading to 15.X. This migration is being removed because of the use of ActiveRecord::Base.connection querying a CI table and while it could be fixed it's simpler to just remove it.

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Closes #342856 (closed)

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