fix(ngcc): provide a unique exit code for timeouts (#36838)

When ngcc fails due to a timeout waiting for another process
to complete, it was not failing with a unique exit code, so that it
was not possible to know if the process can be restarted; compared to
ngcc failing for some more fatal reason.

Now if ngcc exits because of a timeout, the exit code will be 177.

PR Close #36838

packages/compiler-cli/ngcc/main-ngcc.ts

@@ -24,7 +24,7 @@ if (require.main === module) {
       process.exitCode = 0;
     } catch (e) {
       console.error(e.stack || e.message);
-      process.exit(1);
+      process.exit(typeof e.code === 'number' ? e.code : 1);
     }
   })();
 }