Chore: added lock files to gitignore

[anikethsaha]

Prerequisites checklist

• I have read the contributing guidelines.
• The team has reached consensus on the changes proposed in this pull request. If not, I understand that the evaluation process will begin with this pull request and won't be merged until the team has reached consensus.

What is the purpose of this pull request? (put an "X" next to an item)

[ ] Documentation update
[ ] Bug fix (template)
[ ] New rule (template)
[ ] Changes an existing rule (template)
[ ] Add autofixing to a rule
[ ] Add a CLI option
[ ] Add something to the core
[X] Other, please explain:

updating .gitignore

What changes did you make? (Give an overview)

follow-up from here #13004 (comment)
As eslint is not committing lock files , I added them to gitignore for safety as not to get committed in future if not required

Is there anything you'd like reviewers to focus on?

If there is a plan to commit lock files, then this PR needs to be changed

[nzakas]

Thanks!