chore: Removing unnecessary and potentially confusing credential warning message (#11303)

Author: ldetmer

java-translate/google-cloud-translate/src/main/java/com/google/cloud/translate/TranslateOptions.java

@@ -161,10 +161,6 @@ private TranslateOptions(Builder builder) {
     } else if (builder.apiKey != null) {
       credentials = null;
       apiKey = builder.apiKey;
-      logger.log(
-          Level.WARNING,
-          "Ignoring Application Default Credentials {0}: using explicit setting for API key instead.",
-          ServiceOptions.CREDENTIAL_ENV_NAME);
     } else if (credentials != null) { // credentials assigned from ADC in superclass constructor
       apiKey = null;
       if (getDefaultApiKey() != null) {