Revert "fix: change the exec command from ts-node to hardhat"

This reverts commit c78305f.

Author: Gowtham118

packages/block-verification-in-parent-chain-assertion/package.json

@@ -3,7 +3,7 @@
   "version": "1.0.0",
   "description": "This tutorial shows how to verify whether a block has been processed as part of an RBlock assertion on the parent chain.",
   "scripts": {
-    "exec": "hardhat run scripts/exec.js"
+    "exec": "ts-node scripts/exec.ts"
   },
   "dependencies": {
     "@arbitrum/sdk": "^v4.0.1",

packages/gas-estimation/package.json

@@ -3,7 +3,7 @@
   "license": "Apache-2.0",
   "version": "1.0.0",
   "scripts": {
-    "exec": "hardhat run scripts/exec.js"
+    "exec": "ts-node scripts/exec.ts"
   },
   "dependencies": {
     "@arbitrum/sdk": "^v4.0.1",

packages/parent-chain-confirmation-checker/package.json

@@ -3,8 +3,8 @@
   "license": "Apache-2.0",
   "version": "1.0.0",
   "scripts": {
-    "checkConfirmation": "yarn hardhat run scripts/exec.js --action checkConfirmation",
-    "findSubmissionTx": "yarn hardhat run scripts/exec.js --action findSubmissionTx"
+    "checkConfirmation": "yarn ts-node scripts/exec.ts --action checkConfirmation",
+    "findSubmissionTx": "yarn ts-node scripts/exec.ts --action findSubmissionTx"
   },
   "dependencies": {
     "@arbitrum/sdk": "^v4.0.1",