fix: make 11321 and 11330 error formatters backward compatible (#22249)

Author: pieh

packages/gatsby-cli/src/structured-errors/error-map.ts

@@ -312,7 +312,8 @@ const errors = {
     text: (context): string =>
       `"${context.pluginName}" threw an error while running the ${
         context.api
-      } lifecycle:\n\n${context.sourceMessage}${optionalGraphQLInfo(context)}`,
+      } lifecycle:\n\n${context.sourceMessage ??
+        context.message}${optionalGraphQLInfo(context)}`,
     type: Type.PLUGIN,
     level: Level.ERROR,
   },
@@ -408,7 +409,15 @@ const errors = {
   // "X" is not defined in Gatsby's node APIs
   "11330": {
     text: (context): string =>
-      `"${context.pluginName}" threw an error while running the ${context.api} lifecycle:\n\n${context.sourceMessage}\n\n${context.codeFrame}\n\nMake sure that you don't have a typo somewhere and use valid arguments in ${context.api} lifecycle.\nLearn more about ${context.api} here: https://www.gatsbyjs.org/docs/node-apis/#${context.api}`,
+      `"${context.pluginName}" threw an error while running the ${
+        context.api
+      } lifecycle:\n\n${context.sourceMessage ?? context.message}\n\n${
+        context.codeFrame
+      }\n\nMake sure that you don't have a typo somewhere and use valid arguments in ${
+        context.api
+      } lifecycle.\nLearn more about ${
+        context.api
+      } here: https://www.gatsbyjs.org/docs/node-apis/#${context.api}`,
     type: Type.PLUGIN,
     level: Level.ERROR,
   },