Update Search Service to Display Feature Flags in Info Endpoint

Context

We need to update services that use feature flags to include their states in the info endpoint response.

Here, we've updated Core-Common to include feature flag states in the info endpoint: osdu/platform/system/lib/core/os-core-common!296 (merged)

Here, we are using the updated Core-Common: indexer-service!887 (merged)

TODO:

Add bean configuration for each feature flag.
Use either the common feature flag state resolver or the custom FF uses custom configuration.
Update acceptance tests and verify that all future flags are present in response.

AC1 – The service displays all its feature flag states in the info endpoint response.

AC2 – The service utilizes the common feature flag state resolver if feature flags are configured via Core-Common FF interfaces.

AC3 – The service uses custom feature flag state resolvers if feature flags have custom configurations.

AC4 – Acceptance tests are updated to verify that all feature flags are present in the info endpoint response.