Adds the 422 illustration

Purpose

The 422 error page is broken, due to the way we include the illustration. This change takes it out of the GitLab project and into GitLab SVGs so we can import it properly.

https://gitlab.com/gitlab-com/dev-sub-department/section-dev-request-for-help/-/issues/182

Screenshots

Checklist

For a new icon and/or illustration:

• [-] Link to related design issue: N/A Migrating from the main GitLab project as-is
• [-] If this adds an icon ensure that it follows the new icon checklists.
• [-] If this adds an illustration ensure that it follows the new illustration checklists.

For third-party trademarks:

• [-] If this adds or updates an icon or illustration that includes a third-party trademark, ensure that it follows the process for adding third-party trademarks to GitLab.