Ignore engine when yarn update

What does this MR do?

Adds --ignore-engines for yarn command to ignore nodejs version when using yarn

What are the relevant issue numbers?

https://gitlab.com/gitlab-org/gitlab-ee/issues/12471

Test MR

gitlab-org/security-products/tests/js-yarn!20 (closed)

Does this MR meet the acceptance criteria?

• Changelog entry added
• Documentation created/updated for GitLab EE, if necessary
• Documentation created/updated for this project, if necessary
• Documentation reviewed by technical writer or follow-up review issue created
• Tests added for this feature/bug
• Job definition updated, if necessary
  • Auto-DevOps template
  • Job definition example
  • CI Templates
• Conforms to the code review guidelines
• Conforms to the Go guidelines
• Security reports checked/validated by reviewer