Reintroduce direct historical line matching for E-Document drafts

[mynjj]

Summary

• Wire up FindRelatedPurchaseLineInHistory (previously dead code) as a direct matching step before the AI pipeline in E-Doc. Historical Matching
• Sets E-Doc. Purch. Line History Id on matched lines, enabling the source invoice link and additional fields features
• If all lines resolve via direct history, the AI pipeline is skipped entirely

Fixes AB#630431

[github-actions]

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