Remove media palette as this is no longer used by production (#14355)

Author: abeddow91

dotcom-rendering/src/components/Card/Card.stories.tsx

@@ -1228,7 +1228,7 @@ const containerPalettes = [
 	'SombreAltPalette',
 	'SpecialReportAltPalette',
 	'Branded',
-] as const satisfies readonly Omit<DCRContainerPalette, 'MediaPalette'>[];
+] as const satisfies readonly DCRContainerPalette[];
 
 export const WithBranding = () => {
 	const branding = {

dotcom-rendering/src/components/CardHeadline.stories.tsx

@@ -445,7 +445,6 @@ const containerPalettes = [
 	'BreakingPalette',
 	'SpecialReportAltPalette',
 	'Branded',
-	'MediaPalette',
 ] as const satisfies readonly DCRContainerPalette[];
 export const WithContainerOverrides: StoryObj = ({ format }: StoryProps) => (
 	<>