Updates eslint in codemods package

[zamoore]

📌 Summary

If merged, this PR upgrades packages/codemods from ESLint 8 legacy config to ESLint 9 flat config (aligned with showcase/website) and keeps codemods lint/test behavior working.

🛠️ Detailed description

• Updated packages/codemods/package.json to use ESLint 9-era dependencies:
  • eslint -> ^9.27.0
  • added @eslint/js and globals
  • replaced eslint-plugin-node with eslint-plugin-n
  • bumped eslint-config-prettier to ^10.1.5
• Migrated lint configuration from legacy files to flat config:
  • removed packages/codemods/.eslintrc.js
  • removed packages/codemods/.eslintignore
  • added packages/codemods/eslint.config.js

🔗 External links

Jira ticket: HDS-6236

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👀 Component checklist

• Percy was checked for any visual regression
• A changelog entry was added via Changesets if needed (see templates here)

💬 Please consider using conventional comments when reviewing this PR.

📋 PCI review checklist

• If applicable, I've documented a plan to revert these changes if they require more than reverting the pull request.
• If applicable, I've worked with GRC to document the impact of any changes to security controls.
  Examples of changes to controls include access controls, encryption, logging, etc.
• If applicable, I've worked with GRC to ensure compliance due to a significant change to the in-scope PCI environment.
  Examples include changes to operating systems, ports, protocols, services, cryptography-related components, PII processing code, etc.

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Project	Deployment	Actions	Updated (UTC)
hds-showcase	Ready	Preview	May 4, 2026 10:28pm
hds-website	Ready	Preview	May 4, 2026 10:28pm