Fix the application readiness state during migration

Fix the application readiness state during migration

- updating the readiness health indicator to just work on the readiness
  state and not on the overall state.
- before this fix, during migration the readiness, liveness and overall
  status is DOWN.
- after the fix, readiness and overall state would be DOWN, while the
  application will be live, hence liveness probe will show as UP
- ReadinessManager relies on ApplicationReadyEvent now instead of
  ApplicationStartedEvent
- Dynamically register the model loaders during Application startup
- removed the initial delay string from the watchdogs
- Added a new arch rule for the cps init package to be used in
  ncmp-service
- removed the module-sync-delayed package

Issue-ID: CPS-2993
Change-Id: I4c3bbc8633b84984095ad11ca8e4fbade91fd0f2
Signed-off-by: mpriyank <priyank.maheshwari@est.tech>