Change ApplicationEvent for ModelLoading

- Application to use ApplicationStartedEvent as the trigger to start the
  ModelLoading process instead of ApplicationReadyEvent
- Modified the testware to reflect the same

Issue-ID: CPS-2211
Change-Id: I3176b6373f585ec1915c3d43c553e233660225f5
Signed-off-by: mpriyank <priyank.maheshwari@est.tech>
5 files changed