fixed backfill for generating always identity columns - #1036
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fixes #1035
The backfill query used to update the primary key column to itself to fire triggers. PostgreSQL rejects that for
GENERATED ALWAYSidentity columns, so this now updates pgroll’s internal_pgroll_needs_backfillcolumn instead.Tests
go test ./pkg/backfill/...go test ./pkg/migrations -run 'TestAlterColumnValidation/backfill_with_generated_always_identity_primary_key|TestAlterColumnValidation/backfill_with_multiple_primary_keys'