Update numEsimSlots metric to get the number of eSIM slots which helps to identify the eSIM capable devices

Current implementation of SimSlotState calculates the number of active eSIM slots only. Fix this to get the number of all available eSIM slots.
Flag: EXEMPT metrics update
Bug: b/397863564

Change-Id: Icb1a85a249f9ce4727ef8ad572d9e0a8f6bd57c4
3 files changed