[Extensibility Request] issue 8910: expose preview mode on purchase post events

[business-central-extensibility-bot]

Summary

Purchase posting event subscribers need to distinguish actual posting from preview posting so they can avoid running side effects during previews. This change exposes the existing preview state on the two approved purchase posting events while preserving the non-preview behavior of the Purchase Header wrapper.

Changes Made

• Purch.-Post.OnAfterProcessPurchLines - Appended PreviewMode and passed the posting codeunit state, propagated to existing layer counterparts.
• Purch.-Post.OnAfterPostPurchaseDoc - Appended PreviewMode and passed the posting codeunit state, propagated to existing layer counterparts.
• Purchase Header.TriggerOnAfterPostPurchaseDoc - Passed false because this wrapper represents non-preview posting, propagated to existing layer counterparts.

Fixes #8910

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