chore: attempt to drain the stream iterator

Related #2696

Author: BenWhitehead

google-cloud-storage/src/main/java/com/google/cloud/storage/GapicUnbufferedReadableByteChannel.java

@@ -212,7 +212,7 @@ public void close() {
             } catch (IOException e) {
               if (ioException == null) {
                 ioException = e;
-              } else {
+              } else if (ioException != e) {
                 ioException.addSuppressed(e);
               }
             }

google-cloud-storage/src/main/java/com/google/cloud/storage/GrpcStorageOptions.java

@@ -1098,7 +1098,7 @@ static void closeAllStreams(Iterable<InputStream> inputStreams) throws IOExcepti
         } catch (IOException e) {
           if (ioException == null) {
             ioException = e;
-          } else {
+          } else if (ioException != e) {
             ioException.addSuppressed(e);
           }
         }