fix(compiler): For FatalDiagnosticError, inherit the field in the c…

…onstructor

We received a complaint from inside g3 that the previous code was not compatible with `useDefineForClassFields`. This should eliminate the used-before-initialization warning.

packages/compiler-cli/src/ngtsc/diagnostics/src/error.ts

@@ -23,11 +23,13 @@ export class FatalDiagnosticError extends Error {
     // when extending errors in TS and the workaround is to explicitly set the prototype.
     // https://stackoverflow.com/questions/41102060/typescript-extending-error-class
     Object.setPrototypeOf(this, new.target.prototype);
+
+    this.message = super.message as unknown as never
   }
 
   // Trying to hide `.message` from `Error` to encourage users to look
   // at `diagnosticMessage` instead.
-  override message: never = this.message;
+  override message: never;
 
   /**
    * @internal