* Making getAnalyticsIdFromMongoUser private to UserAnalyticsIdCache
* renaming userAnalyticsIdCache to UserAnalyticsIdCache
* deleting function _getAnalyticsIdFromMongoUser
* renaming userAnalyticsIdCache to UserAnalyticsIdCache part 2
* format:fix
* adding upperCamelCase
* capital case first letter
GitOrigin-RevId: 2e9c18c544b8cffb53838aed56e1ef16979606a5