Rename Indexable::getAllPreferenceControllers.

To getPreferenceControllers. "all" is redundant. Then internally, the
old getPreferenceControllers() is renamed to
createPreferenceControllers() to emphasize the controllers are created
from code (versus the ones created from xml).

Bug: 73668763
Test: robotest
Change-Id: Ifec46aefdc2a418031c8e152028b30bdcd396fc7

tests/robotests/src/com/android/settings/dashboard/DashboardFragmentSearchIndexProviderInspector.java

@@ -50,7 +50,7 @@ public class DashboardFragmentSearchIndexProviderInspector {
         final List<AbstractPreferenceController> controllersFromSearchIndexProvider;
         final List<AbstractPreferenceController> controllersFromFragment;
         try {
-            controllersFromSearchIndexProvider = provider.getAllPreferenceControllers(context);
+            controllersFromSearchIndexProvider = provider.getPreferenceControllers(context);
         } catch (Throwable e) {
             // Can't do much with exception, assume the test passed.
             return true;