Introduce activity action to launch Reset mobile network settings

Reset mobile network settings is the activity in Settings app (or
other system apps) to launch the flow to reset mobile networks
to factory default states.

The action can launch the page with startActivity or
startActivityForResult on devices that support it.

Help center or troubleshooter applications can help end user
resolving cellular network issues by going through the reset
flow, usually as a last resort solution.

Launching the reset mobile settings with action has the same
restrictions as from other UI path (e.g. only for primary users)
and it keeps exactly the same reset flow.

Bug: 271921464
Test: atest TelephonyManagerTest
Test: Feature functionality test
Change-Id: I8cc9727a745e2bdce29ad5aca22af817196e4bb8