chore: reorganize dedupe code#14641

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valentijnscholten wants to merge 9 commits intoDefectDojo:devfrom

valentijnscholten:feature/import-preview

Commits on Apr 4, 2026

Add match-only deduplication helpers and close-old queryset extraction.
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Commits on Apr 5, 2026

Batch-refresh close_old_findings status fields to avoid N refresh_from_db queries.
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docs: cite #12291 for close_old_findings status refresh origin
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perf: chunk close_old_findings status sync queries (1000 PKs per SELECT)
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fix(parsers): use unsaved_tags instead of tags= in Finding constructor for performance
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fix: resolve ruff D203 and COM812 lint errors from formatter conflict
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fix: update tests to check unsaved_tags instead of tags
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fix: correct unsaved_tags assertions to expect lists and fix tag ordering
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fix(reimport): do not update finding tags on reimport for matched findings
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