Configure TG import failOnMissingEntities on code level.

At the moment fail on missing entities can be configured only with "failOnMissingEntities" system property. This approach has following limits:

• You cannot have different behaviour on different TG-based imports.
• If data processing expects fail on missing, and launch configuration does not include system property, the result of a import is potential DB semantic corruption that the software cannot handle, leading to data loss. (Or customers sending their databases to us for debugging)