Fix errorprone issues

IgnoredPureGetter, LenientFormatStringValidation, ProtocolBufferOrdinal, and ReturnValueIgnored.
https://errorprone.info/bugpatterns

Bug: 253827323
Test: RUN_ERROR_PRONE=true m javac-check
Change-Id: Ib0a0335aa04b36924adcbfecc830b7392c0e5bec

src/com/android/settings/bluetooth/Utils.java

@@ -289,7 +289,7 @@ public final class Utils {
         }
         ThreadUtils.postOnBackgroundThread(() -> {
             for (Supplier<?> supplier : suppliers) {
-                supplier.get();
+                Object unused = supplier.get();
             }
             ThreadUtils.postOnMainThread(runnable);
         });