Cherry pick/pr6608+6585

[soblin]

Description

• feat(intersection_occlusion): quickly delete occlusion wall on change from green to yellow/red autowarefoundation/autoware.universe#6608
• fix(intersection_occlusion): estimate dynamic occlusion source with triangle autowarefoundation/autoware.universe#6585

の盛り込みです．スプレッドシートに書きましたが効くシーンはそんなにないと思います．

Related links

Tests performed

Notes for reviewers

Interface changes

Effects on system behavior

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[shmpwk]

LGTM