[GRDM-55275] Implement Group Management Integration with GakuNin mAP#164

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feature/nii_grdm_202510_step2/2.3_mapcore_group_management

Commits on Dec 16, 2025

ref: 2.3.グループ管理連携機能開発: commit source code and UT implement mapcore group management
tma-hcphat
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