fix(editor): Show correct error messages on Ask AI (#16913)

cypress/e2e/6-code-node.cy.ts

@@ -180,7 +180,11 @@ return []
 				{ code: 400, message: 'Code generation failed due to an unknown reason' },
 				{ code: 413, message: 'Your workflow data is too large for AI to process' },
 				{ code: 429, message: "We've hit our rate limit with our AI partner" },
-				{ code: 500, message: 'Code generation failed due to an unknown reason' },
+				{
+					code: 500,
+					message:
+						'Code generation failed with error: Request failed with status code 500. Try again in a few minutes',
+				},
 			];
 
 			handledCodes.forEach(({ code, message }) => {