chore: Ignore `lerna.json` for prettier

[github-actions]

Note

The pull request "chore: Ignore lerna.json for prettier" was created by @chargome but did not reference an issue. Therefore this issue was created for better visibility in external tools like Linear.

This caused issues in releases where the file got modified somewhere in the lerna pipeline which then failed our prettier job.

[linear]

JS-1694

[github-actions]

A PR closing this issue has just been released 🚀

This issue was referenced by PR #19288, which was included in the 10.40.0 release.