Fix unable to erase eSIM

Before this change,
- eSIM will be erased twice, one with result callback and one without
  result callback.
- During reset, ResetNetworkConfirm could interrupted by subscription
  invalid event, which happens during reset.

After this change,
- eSIM will be erased only once, result callback is registered
  separately.
- Explicit exit the page when reset finish, and ignore the subscription
  invalid event after reset started.

Bug: 328293508
Flag: EXEMPT bug fix
Test: manual - dry run the reset
Test: ResetNetworkConfirmTest
Change-Id: I51395a556b1c8775192d5897a87f13046c042578