Remove simulated LTZP and enable replacement

Remove "simulated" location time zone provider mode and enable "fake"
location time zone providers. This allows for more realistic testing
with binder-based LTZPs.

Many of the changes in this commit are the removal of command-line infra
and test logic associated with "simulated" mode. The new
"start_with_test_providers" command is required to enable changes to how
providers are discovered, since test providers are not found on the
system image and will not have the full permissions expected (which are
requirements of "real" providers). As part of this change "state
recording", something only used in tests, can only be turned on by
"start_with_test_providers". A "clear_recorded_provider_states" has been
added to enable tests to clear the recorded state.

The new test mode config deliberately does not survive a reboot.

Bug: 188780558
Bug: 184947690
Test: atest CtsLocationTimeZoneManagerHostTest
Test: atest com.android.server.timezonedetector
Change-Id: I7d8fc217fa070aee791fb376efb398057320503a