[Settings] eSIM transfer: MobileNetworkSummaryController

1. MobileNetworkSummaryController

 - No matter single SIM or multiple SIMs, always launch MobileNetworkListFragment
 - Remove the + and |

APM off: https://screenshot.googleplex.com/7M8qzsXFesy3nDi.png
APM on: https://screenshot.googleplex.com/C4ZnbpgUTPzTijL.png

2. Fix the APM mode

Bug: 244786012
Bug: 261810065
Test: make RunSettingsRoboTests ROBOTEST_FILTER=MobileNetworkSummaryControllerTest
Change-Id: I8e5c9b8a58ef13b6deaea284e9793077b2da58f6