chore: migrate DragHandle component from jsx to tsx (#17326)

* migrate DragHandle component from jsx to tsx

* Convert class based component to functional component

superset-frontend/src/dashboard/components/dnd/DragHandle.tsx

@@ -0,0 +1,49 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+import React, { LegacyRef } from 'react';
+import cx from 'classnames';
+
+interface DragHandleProps {
+  position: 'left' | 'top';
+  innerRef: LegacyRef<HTMLDivElement> | undefined;
+  dotCount: number;
+}
+
+export default function DragHandle({
+  position = 'left',
+  innerRef = null,
+  dotCount = 8,
+}: DragHandleProps) {
+  return (
+    <div
+      ref={innerRef}
+      className={cx(
+        'drag-handle',
+        position === 'left' && 'drag-handle--left',
+        position === 'top' && 'drag-handle--top',
+      )}
+    >
+      {Array(dotCount)
+        .fill(null)
+        .map((_, i) => (
+          <div key={`handle-dot-${i}`} className="drag-handle-dot" />
+        ))}
+    </div>
+  );
+}