Remove all the implementation for keep eSIM profile during FDR

When we show the option to users to allow them decide whether they want
to keep eSIM profiles during FDR, we remove erasing eSIM profiles from
CompleteBootService. So there is no need to call
EuiccManager#retainSubscriptionsForFactoryReset again. And when we don't
show this option to users, we will always erase eSIM profiles with
isWipeEuicc equals to true.

Bug: 67500470
Test: E2E
Change-Id: Ide4ee5fbfd4b2aadc78071f8ecb8e0424a37db44