Remove astro core hack of passing Fragment to MDX pages

No longer needed as this is fixed for all MDX content now within the MDX integration

packages/astro/src/core/render/core.ts

@@ -3,7 +3,7 @@ import type { LogOptions } from '../logger/core.js';
 import type { RenderContext } from './context.js';
 import type { Environment } from './environment.js';
 
-import { Fragment, renderPage as runtimeRenderPage } from '../../runtime/server/index.js';
+import { renderPage as runtimeRenderPage } from '../../runtime/server/index.js';
 import { attachToResponse } from '../cookies/index.js';
 import { AstroError, AstroErrorData } from '../errors/index.js';
 import { getParams } from '../routing/params.js';
@@ -112,13 +112,6 @@ export async function renderPage(mod: ComponentInstance, ctx: RenderContext, env
 		Object.assign(pageProps, { components: (mod as any).components });
 	}
 
-	// HACK: expose `Fragment` for all MDX components
-	if (typeof mod.default === 'function' && mod.default.name.startsWith('MDX')) {
-		Object.assign(pageProps, {
-			components: Object.assign((pageProps?.components as any) ?? {}, { Fragment }),
-		});
-	}
-
 	const response = await runtimeRenderPage(
 		result,
 		Component,