Revert #4819

[johanbrandhorst]

This reverts commit 830ba27. Unfortunately this suffered from a bug that could cause a panic. Revert until we can reintroduce it without the bug.

See etcd-io/etcd#19509 for more info.

[johanbrandhorst]

I think the problem is that there is no synchronization between returning from the handler and using the http.ResponseWriter in the goroutine that's created to handle the errors. We can reintroduce this if we add a channel or something to synchronize exiting from the goroutine with exiting from the handler.

CC @ianbbqzy

[ahrtr]

Thanks for the quick fix and release of v2.26.2!!! @johanbrandhorst