Fix release scripts to check npm packages (#49788)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/49788

Release of 0.78 was successful but it failed to verify the package of NPM because of some error in the JS files.

Preparing for 0.79, I discovered some other issues in the NPM checking scripts.

This change should fix them.

## Changelog:
[Internal] - Fix publishing scripts

Reviewed By: fabriziocucci

Differential Revision: D70489717

fbshipit-source-id: 02a37d9a86fe108c7f7d2d634b8c0727dabb153d

.github/workflow-scripts/verifyPublishedPackage.js

@@ -42,7 +42,7 @@ async function verifyPublishedPackage(
       }
 
       log(
-        `🐌 ${packageName}@${tag} → ${pkg.version} on npm and not ${version} as expected, retrying...`,
+        `🐌 ${packageName}@${tag} → ${json.version} on npm and not ${version} as expected, retrying...`,
       );
     } catch (e) {
       log(`Nope, fetch failed: ${e.message}`);