Stage component icon migration

What does this MR do and why?

A small MVC for Migrate angle icon to chevron in app/assets/jav... (#362814 - closed) to migrate the angle icon to chevron in app/assets/javascripts/ide/components/jobs/stage.vue.

Screenshots or screen recordings

Before	After

How to set up and validate locally

1. Visit any project Web IDE with a valid pipeline such as http://localhost:3000/-/ide/project/gitlab-org/gitlab-test/edit/master/-/
2. Click the pipleine button.
3. Click the jobs tab
4. Inspect the collapse for any job to see the new icon

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Closes #362814 (closed)