OFBIZ-13463: Fixed false late flag on REQUIRED_MRP proposed supply in MRP engine

[diveshdut]

Jira Ticket:

https://issues.apache.org/jira/browse/OFBIZ-13463

Summary

Fixed a false isLate = Y condition for proposed MRP supply generated from stock-policy replenishment markers.

MRP creates an internal replenishment trigger when current QOH is below ProductFacility.minimumStock, then immediately creates proposed supply. The proposed requirement start date can be a few milliseconds earlier than the MRP run timestamp, which caused the proposed supply event to be incorrectly marked late.

This change prevents that false late classification for REQUIRED_MRP- driven proposed supply while preserving the existing late behavior for real late demand/supply situations.

Changes

• added a small helper in MrpServices to evaluate whether a proposed order should be late
• excluded REQUIRED_MRP source events from proposed-order late classification
• kept the original timestamp-based late behavior for non-REQUIRED_MRP source events
• added dedicated MRP regression tests
• added a dedicated manufacturing MRP test suite registration