Add subIdChangedToInvalid API in ImsEnablementTracker

When the ImsEnablementTracker is created, the state machine is created as the number of slots.
Added an API to change the state of state machine related to the slotId whose the subId was changed to invalid to Default.

Bug: b/257485774
Test: inserted TMO SIM > removed TMO SIM > inserted AT&T SIM > removed AT&T SIM > inserted TMO SIM
Test: activate eSIM > inserted TMO SIM > inactivate eSIM > activate eSIM > removed TMO SIM > inserted TMO SIM
Test: atest ImsEnablementTrackerTest

Change-Id: I738de666907941edc8fda6a33ad783a6c52d6b93