Drop experiment_users table as it is no longer used
What does this MR do and why?
Dropping table as per this procedure - https://docs.gitlab.com/ee/development/migration_style_guide.html#dropping-a-database-table
Code already removed for it via !100862 (merged)
Checked for data impacts in #349246 (comment 812091121)
rollback verification: https://gitlab.com/gitlab-org/gitlab/-/jobs/3243468566
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #349246 (closed)
Edited by Doug Stull