Disable CannotMockFinalClass/Method in open-source.

We want this enabled internally, but externally, Mockito can be configured to allow mocking `final` classes (and methods). It's probably a bad idea to default it on.

Fixes #3281

PiperOrigin-RevId: 456754155

core/src/main/java/com/google/errorprone/scanner/BuiltInCheckerSuppliers.java

@@ -800,8 +800,6 @@ public static ScannerSupplier errorChecks() {
           BugPatternNaming.class,
           ByteBufferBackingArray.class,
           CacheLoaderNull.class,
-          CannotMockFinalClass.class,
-          CannotMockFinalMethod.class,
           CanonicalDuration.class,
           CatchAndPrintStackTrace.class,
           CatchFail.class,
@@ -1026,6 +1024,8 @@ public static ScannerSupplier errorChecks() {
           BooleanParameter.class,
           BuilderReturnThis.class,
           CanIgnoreReturnValueSuggester.class,
+          CannotMockFinalClass.class,
+          CannotMockFinalMethod.class,
           CatchingUnchecked.class,
           CheckedExceptionNotThrown.class,
           ClassName.class,