Revert "Merge branch '587231-update-session-list-item-format' into 'master' "

What does this MR do and why?

This reverts !221789 (merged) to switch to an older UI without the last flow messages being displayed in the sessions list view. This is being done to reduce the data load with getUserAgentFlows

References

https://gitlab.com/gitlab-org/gitlab/-/work_items/602554

Incident - https://gitlab.com/gitlab-com/gl-infra/gitlab-dedicated/incident-management/-/issues/3702

Screenshots or screen recordings

Before After

How to set up and validate locally

  1. Pull from this branch and start GDK
  2. Go to AI > Sessions, ensure the page loads correctly
  3. Go to user sessions in right side panel, ensure it loads correctly

MR acceptance checklist

Evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Merge request reports

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