Fix InvalidateModelDefinitionsListenerTest.shouldLunchExportWithNoExceptions

Expected size:<2> but was:<4> in:<[org.nuxeo.ai.model.serving.ModelDescriptor@5804f0f3,    org.nuxeo.ai.model.serving.ModelDescriptor@2cbe2d8e,    org.nuxeo.ai.model.serving.ModelDescriptor@49e7c13d,    org.nuxeo.ai.model.serving.ModelDescriptor@1052844d]>	at org.nuxeo.ai.listeners.InvalidateModelDefinitionsListenerTest.shouldLunchExportWithNoExceptions(InvalidateModelDefinitionsListenerTest.java:99)ERROR [AbstractPubSubProvider] Exception in subscriber for topic: ai-model-invalidationorg.nuxeo.ecm.core.api.local.LocalException: No such repository: default