fix(gax): make isLoggingEnabled and setLoggingEnabled package private

Author: westarle

gax-java/gax/src/main/java/com/google/api/gax/logging/LoggingUtils.java

@@ -179,7 +179,7 @@ public static void logActionableError(
       LoggerProvider loggerProvider,
       org.slf4j.event.Level level,
       String message) {
-    if (loggingV2Enabled) {
+    if (loggingEnabled) {
       org.slf4j.Logger logger = loggerProvider.getLogger();
       Slf4jUtils.log(logger, level, logContext, message);
     }

gax-java/gax/src/test/java/com/google/api/gax/logging/LoggingUtilsTest.java

@@ -94,11 +94,11 @@ void tearDown() {
 
   @Test
   void testLogActionableError_loggingDisabled() {
-    LoggingUtils.setLoggingV2Enabled(false);
+    LoggingUtils.setLoggingEnabled(false);
     LoggerProvider loggerProvider = mock(LoggerProvider.class);
 
     LoggingUtils.logActionableError(
-        Collections.emptyMap(), loggerProvider, org.slf4j.event.Level.INFO, "message");
+        Collections.emptyMap(), loggerProvider, org.slf4j.event.Level.DEBUG, "message");
 
     verify(loggerProvider, never()).getLogger();
   }
@@ -120,3 +120,4 @@ void testLogActionableError_success() {
     verify(loggerProvider).getLogger();
   }
 }
+