Intersection Model Unit tests take 11 minutes to execute

[paulbourelly999]

Summary

Many of the intersection_model unit tests, specifically ones related to osm map processing, take a long amount of time since they need to read and process the large osm map file. Each unit test that needs to read the osm map file takes approximately 35s. There are 19 such unit tests. If we can make them share a single read operation we can significantly reduce overall build time for CARMA-Streets. (https://github.com/usdot-fhwa-stol/carma-streets/actions/runs/4245762961/jobs/7381695043#step:19:1490)

Reasoning for new functionality

Improve CI build and test time for CARMA-Streets