fix(gatsby-plugin-sharp): Don't swallow sharp errors (#26806)

Co-authored-by: gatsbybot <[email protected]>

Author: ascorbic

packages/gatsby-plugin-sharp/src/sharp-error.js

@@ -13,6 +13,7 @@ export class SharpError extends Error {
       fullErrorMessage += `
 
 Original error:
+${err.shortMessage ?? ``}
 ${err.message}`
     }