feat(intersection): memorize last observed valid traffic light information #6048
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Description
memorize the non-UNKNOWN information of the associated traffic light and use that for handling sudden empty observation due to occlusion or out-of-view.
Related links
#6061
Tests performed
before
before this PR, intersection_occlusion behaves as the "before" video in #6061
after
even if the info of traffic light get unavailable, occlusion wall does not re-appear.
Notes for reviewers
Interface changes
none
Effects on system behavior
none
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