🎨 style(MongoDB icon): rename SlackSVG to MongoDBSVG for better naming

The SlackSVG component was renamed to MongoDBSVG to better reflect the actual icon being used. This improves the naming consistency and makes the code more readable.

src/frontend/src/icons/MongoDB/index.tsx

@@ -1,9 +1,9 @@
 import React, { forwardRef } from "react";
-import { ReactComponent as SlackSVG } from "./mongodb-icon.svg";
+import { ReactComponent as MongoDBSVG } from "./mongodb-icon.svg";
 
 export const MongoDBIcon = forwardRef<
   SVGSVGElement,
   React.PropsWithChildren<{}>
 >((props, ref) => {
-  return <SlackSVG ref={ref} {...props} />;
+  return <MongoDBSVG ref={ref} {...props} />;
 });