replace usage of old maps endpoint

  getModelsString: (): string => `projects/${PROJECT_ID}/models/`,

should be replaced by projects/${PROJECT_ID}/maps/

changed milestone to %v19.0.0~alpha.0

created branch 317-replace-usage-of-old-maps-endpoint to address this issue

mentioned in merge request !319 (merged)

this requires also replacing project endpoint with the new one (otherwise we have no information about top map, and the top map is not necessary the first)

added in progress label

mentioned in commit 7c9ea5f2

closed with merge request !319 (merged)

removed in progress label