Remove COOP header
What does this MR do and why?
We encountered an issue during rollout (see #425701 (comment 1586363320)). After further investigation we determined this feature won't work as intended. Reverting !131571 (merged)
The original implementation also created a new BaseActionController class, which I still think is a good idea long-term. However, absent an initial use-case it doesn't make sense to keep this base controller around. We can add it back later if/when such a use-case comes up again.
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