MLE-24763 Enabling lint in Jenkinsfile

[rjrudin]

Using a very minimal strategy now. There are 3 TODO's for things that ought to become errors soon. Will open separate Jira tickets for those.

[Copilot]

Pull Request Overview

This PR enables linting in the Jenkinsfile with a minimal strategy by downgrading certain ESLint rules from errors to warnings. The changes allow the lint step to run in CI while deferring fixes for equality checks, unused variables, and var declarations to future PRs.

• Added npm lint script and Jenkinsfile integration with --quiet flag to only fail on errors
• Downgraded three ESLint rules (eqeqeq, no-unused-vars, no-var) from error to warn severity
• Added TODO comments indicating these warnings should be addressed in follow-up work

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
package.json	Added npm lint script to enable running ESLint via npm
eslint.config.js	Downgraded three lint rules to warnings with TODO comments for future fixes
Jenkinsfile	Added runLint() function and integrated it into the pipeline's dev branch stage

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[github-actions]

Copyright Validation Results
Total: 3 | Passed: 1 | Failed: 0 | Skipped: 2 | at: 2025-10-22 17:15:05 UTC | commit: 3716a74

⏭️ Skipped (Excluded) Files

• Jenkinsfile
• package.json

✅ Valid Files

• eslint.config.js

✅ All files have valid copyright headers!