Update /images/ci/ci-cd-architecture_2x.png to new illustration

Why is this change being made?

This MR updates the /images/ci/ci-cd-architecture_2x.png illustration. It the same image located at /images/blogimages/cicd_pipeline_infograph.png.

The new image will be visible on /stages-devops-lifecycle/continuous-integration/

Author Checklist

• Provided a concise title for the MR
• Added a description to this MR explaining the reasons for the proposed change, per say-why-not-just-what
• Assign this change to the correct DRI
  • If the DRI for the page/s being updated isn’t immediately clear, then assign it to your manager.
  • If your manager does not have merge rights, please ask someone to merge it AFTER it has been approved by your manager in #mr-buddies.
  • If the changes relate to any part of the project other than updates to content and/or data files please make sure to ping @gl-static-site-editor in a comment for a review and merge. For example changes to .gitlab-ci.yml, JavaScript/CSS/Ruby code or the layout files.

Closes #8739 (closed)