Toggle subscription persistence for model loader

Current implementation will attempt to persist the subscription model for subscription create events even when the model loader is disabled which causes a persistence error. Subscription Model will now be persisted based on whether the model loader is enabled

Issue-ID: CPS-1394
Signed-off-by: lukegleeson <luke.gleeson@est.tech>
Change-Id: I8f8cfc47996eed6b95fd3958996f16c8395dc341
2 files changed