GetMockCacheList returns a mocked list of cache which contains the census topic cache and navigation cache.

NewNavigationCache create a navigation cache object to be used in the service which will update at every updateInterval If updateInterval is nil, this means that the cache will only be updated once at the start of the service.

NavigationCacheKey is used to cache the navigation bar data.

List is a list of caches for the dp-frontend-dataset-controller.

NavigationCache is a wrapper to dpcache.Cache which has additional fields and methods specifically for caching navigation data.