Set exit code on exceptions thrown in the CLI

Author: frankfarzan

ts/create-kpt-functions/package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "create-kpt-functions",
-  "version": "0.16.3",
+  "version": "0.16.4",
   "description": "KPT functions CLI",
   "author": "KPT Authors",
   "license": "Apache-2.0",

ts/create-kpt-functions/package.json

@@ -124,5 +124,6 @@ async function main() {
     await main();
   } catch (e) {
     console.error(e);
+    process.exitCode = 1;
   }
 })();