Changed the contentType from text/plain to default content type in parquet and orc format

Author: flakrimjusufi

src/main/java/io/cdap/plugin/gcp/gcs/sink/GCSBatchSink.java

@@ -430,15 +430,15 @@ public void validateContentType(FailureCollector failureCollector) {
           }
           break;
         case FORMAT_PARQUET:
-          if (!contentType.equalsIgnoreCase(CONTENT_TYPE_TEXT_PLAIN)) {
+          if (!contentType.equalsIgnoreCase(DEFAULT_CONTENT_TYPE)) {
             failureCollector.addFailure(String.format("Valid content type for parquet is %s",
-                                                      CONTENT_TYPE_TEXT_PLAIN),
+                                                      DEFAULT_CONTENT_TYPE),
                                         null).withConfigProperty(NAME_CONTENT_TYPE);
           }
           break;
         case FORMAT_ORC:
-          if (!contentType.equalsIgnoreCase(CONTENT_TYPE_TEXT_PLAIN)) {
-            failureCollector.addFailure(String.format("Valid content type for orc is %s", CONTENT_TYPE_TEXT_PLAIN),
+          if (!contentType.equalsIgnoreCase(DEFAULT_CONTENT_TYPE)) {
+            failureCollector.addFailure(String.format("Valid content type for orc is %s", DEFAULT_CONTENT_TYPE),
                                         null).withConfigProperty(NAME_CONTENT_TYPE);
           }
           break;