[Cosmos] Fix excess GetDatabaseAccount calls and eliminate data-plane fallback to customer endpoint (#25468)#26815

tvaron3 merged 10 commits into

Azure:mainAzure/azure-sdk-for-go:mainfrom

tvaron3:tvaron3/25468-dbaccount-rootcausetvaron3/azure-sdk-for-go:tvaron3/25468-dbaccount-rootcauseCopy head branch name to clipboard