[Extensibility Request] issue 10769: add quantity validation events

[business-central-extensibility-bot]

Summary

Extensions currently cannot replace quantity rounding and base-quantity calculation on requisition lines because those operations run before any available publisher. This change adds before and after validation events around the existing Quantity validation logic so extensions can handle specialized quantity models while standard behavior remains unchanged.

Changes Made

• Requisition Line.Quantity OnValidate - added handled before-validation and unconditional after-validation publishers around the extracted standard validation logic, propagated to the existing IT layer counterpart.

Fixes #10769

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