Make creation of GeoModel ConfigFlags dynamic

John Derek Chapmanrequested to merge
jchapman/athena:GeoModelFlagsDynamic_master into master

Make creation of GeoModel ConfigFlags dynamic avoids attempts to access the DDDB unless required. This will make it possible to use ComponentAccumulator-based configuration in the AthGeneration project.

After adding some additional protections, the testAllConfigFlags_EVNT unit test should now also pass in the AthGeneration project and so can be switch on there.

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