fix(connectivity_check): revert to CommonJS for janus-core compatibility

ES modules don't work well with @racker/janus-core subdirectory imports.
Reverting to CommonJS which works reliably with the package.

JIRA: PLATEXP-11106

Author: sai-praveen-os

modules/connectivity_check/lambda/index.ts

@@ -1,7 +1,7 @@
-import { Socket } from 'node:net';
-import { lookup } from 'node:dns/promises';
-import * as stats from '@racker/janus-core/lib/stats';
-import * as log from '@racker/janus-core/lib/log';
+const { Socket } = require('net');
+const { lookup } = require('dns/promises');
+const stats = require('@racker/janus-core/lib/stats');
+const log = require('@racker/janus-core/lib/log');
 
 interface TestTarget {
   host: string;
@@ -28,7 +28,7 @@ interface LambdaEvent {
   targets: TestTarget[];
 }
 
-export const handler = async (event: LambdaEvent): Promise<TestResult[]> => {
+exports.handler = async (event: LambdaEvent): Promise<TestResult[]> => {
   const env = process.env.ENVIRONMENT || 'unknown';
 
   log.initialize('connectivity-check', {

modules/connectivity_check/lambda/package.json

@@ -1,7 +1,6 @@
 {
   "name": "connectivity-check-lambda",
   "version": "1.0.0",
-  "type": "module",
   "engines": {
     "node": "~22"
   },

modules/connectivity_check/lambda/tsconfig.json

@@ -1,15 +1,12 @@
 {
   "compilerOptions": {
     "target": "ES2022",
-    "module": "ES2022",
+    "module": "commonjs",
     "lib": ["ES2022"],
     "outDir": ".",
     "rootDir": ".",
     "strict": false,
-    "esModuleInterop": true,
     "skipLibCheck": true,
-    "forceConsistentCasingInFileNames": true,
-    "moduleResolution": "bundler",
     "resolveJsonModule": true
   },
   "include": ["index.ts"],

modules/connectivity_check/scripts/build-lambda.sh

@@ -30,11 +30,6 @@ npm install --no-package-lock
 echo "Compiling TypeScript..."
 npx tsc
 
-# Fix ES module imports - add /index.js to janus-core subpath imports
-echo "Fixing ES module imports..."
-sed -i "s|from '@racker/janus-core/lib/stats'|from '@racker/janus-core/lib/stats/index.js'|g" index.js
-sed -i "s|from '@racker/janus-core/lib/log'|from '@racker/janus-core/lib/log/index.js'|g" index.js
-
 # Remove TypeScript source and dev dependencies
 rm -f index.ts tsconfig.json
 npm prune --production