add digest property to error prop (#56339)

Matching the conventions laid out in https://nextjs.org/docs/app/api-reference/file-conventions/error

Author: Syphini

docs/02-app/01-building-your-application/01-routing/07-error-handling.mdx

@@ -32,7 +32,7 @@ export default function Error({
   error,
   reset,
 }: {
-  error: Error
+  error: Error & { digest?: string }
   reset: () => void
 }) {
   useEffect(() => {
@@ -111,7 +111,7 @@ export default function Error({
   error,
   reset,
 }: {
-  error: Error
+  error: Error & { digest?: string }
   reset: () => void
 }) {
   return (
@@ -182,7 +182,7 @@ export default function GlobalError({
   error,
   reset,
 }: {
-  error: Error
+  error: Error & { digest?: string }
   reset: () => void
 }) {
   return (