Remove dashboard_notification_limit column
What does this MR do and why?
Remove dashboard_notification_limit column - step 2 in column removal - https://docs.gitlab.com/ee/development/database/avoiding_downtime_in_migrations.html#dropping-the-column-release-m1
- no longer used or needed
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 #415482
Edited by Doug Stull