CI job token deprecation - update for migration tool

Jocelyn Eillisrequested to merge
jocelynjane-master-patch-34c7 into master

What does this MR do and why?

Now that we have details for the migration tool, updating the deprecation notice for customers to take action and prepare for our already announced deprecation.

References

gitlab-com/www-gitlab-com!137742 (closed) - closing in favor of updating this notice.

Edited by Marcel Amirault

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