DEV: Correct historical badge and user_badge index discrepancies (PR #10017)

Badge and user_badge tables were created using add_column index: true When the migration was written, index: true was a no-op for non-reference columns Since then, rails made it work https://github.com/rails/rails/commit/9a0d35e820464f872b0340366dded639f00e19b9 This migration adds the index to very old sites, so that we have a consistent state

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