Update post migration to drop column only if it exists
What does this MR do and why?
This MR updates a post migration so that columns are dropped only when they exist.
Without this change, upgrades from 16.4 to 16.5 are failing on migrations, please see original report here: #429017 (closed)
The patch for 16.5 is here: !134867 (merged)
Update migration to drop column only if it exists
Changelog: other
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