[DevOverlay] Remove Dialog Banner (vercel#74464)

This PR removed the Dialog Banner as it is removed in the renewal design.

![CleanShot 2025-01-02 at 22.04.02.png](https://graphite-user-uploaded-assets-prod.s3.amazonaws.com/dQEaKpg78raP6UllhQTZ/c24349a8-c4c4-40e8-9c62-d2580812ec1c.png)

Author: devjiwonchoi

packages/next/src/client/components/react-dev-overlay/_experimental/internal/components/Dialog/Dialog.tsx

@@ -82,7 +82,6 @@ const Dialog: React.FC<DialogProps> = function Dialog({
       aria-describedby={props['aria-describedby']}
       aria-modal="true"
     >
-      <div data-nextjs-dialog-banner className={`banner-${type}`} />
       {children}
     </div>
   )

packages/next/src/client/components/react-dev-overlay/_experimental/internal/components/Dialog/styles.ts

@@ -41,32 +41,6 @@ const styles = css`
     }
   }
 
-  [data-nextjs-dialog-banner] {
-    position: relative;
-  }
-  [data-nextjs-dialog-banner].banner-warning {
-    border-color: var(--color-ansi-yellow);
-  }
-  [data-nextjs-dialog-banner].banner-error {
-    border-color: var(--color-ansi-red);
-  }
-
-  [data-nextjs-dialog-banner]::after {
-    z-index: 2;
-    content: '';
-    position: absolute;
-    top: 0;
-    right: 0;
-    width: 100%;
-    /* banner width: */
-    border-top-width: var(--size-gap-half);
-    border-bottom-width: 0;
-    border-top-style: solid;
-    border-bottom-style: solid;
-    border-top-color: inherit;
-    border-bottom-color: transparent;
-  }
-
   [data-nextjs-dialog-content] {
     overflow-y: auto;
     border: none;