[ManualNetworkSelect] Improve error handling

1. [batch mode] Support graceful app stop behavior
   Avoid thread crash when UI abort the request.
2. [incremental mode] Stop search UI earlier when error during API access
   Generate error instead of keeping UI in progressing
   when fail to access Telephony API

Bug: 139398483
Bug: 140448617
Test: atest NetworkScanHelperTest
Change-Id: I429f3aa2ef692c27100514faa413b16dbd2459d7