Disconnect when remote key is missing

Bug: 376280645
Bug: 376680866
Test: mmm packages/modules/Bluetooth
Test: Manual | pair with device, forget bond from the remote, connect to it, observe UX prompts
Ignore-AOSP-First: security fix
Flag: com.android.bluetooth.flags.sec_disconnect_on_le_key_missing
Change-Id: I20135e97eb297a1472959e179dea9c3a94df1727