[Launcher3] Supports child Settings navigation on Search

After adding all launcher settings to search, adding support for navigating to child settings if the setting isn't on the current screen.

result: go/launcher-settings-navigate-to-child

Bug: 293390881
Flag: com.android.launcher3.navigate_to_child_preference
Test: Manual

Change-Id: I5eecbf9a3c569f58b6c8830443d86ba122e4f53b