fix: there was a race condition when running auth test where keys were getting deleted while still being used, so make each key name unique

Author: ldetmer

auth/src/test/java/com/google/cloud/auth/samples/AuthExampleIT.java

@@ -61,12 +61,10 @@ public void testAuthExplicitNoPath() throws IOException {
     assertTrue(output.contains("Buckets:"));
   }
 
-  @Ignore("Temporarily disabled due to failing test (Issue #10023).")
   @Test
   public void testAuthApiKey() throws IOException, IllegalStateException {
-    //TODO: Re-enable this test after fixing issue #10023.
     String projectId = ServiceOptions.getDefaultProjectId();
-    String keyDisplayName = "Test API Key";
+    String keyDisplayName = "Test API Key " + System.currentTimeMillis();;
     String service = "language.googleapis.com";
     String method = "google.cloud.language.v2.LanguageService.AnalyzeSentiment";
     Key apiKey = null;