Revert "Broker can handle admin request to pause exporting"

[oleschoenburg]

Reverts #9945 as a temporary workaround for #10014

[oleschoenburg]

@deepthidevaki I think reverting this is okay because it's not yet used by anything, it unblocks other PRs that are failing CI due to #10014 and it gives me a little bit more time to fix #10014 properly.

[deepthidevaki]

Thanks. But not sure if you really have to revert this. I think it is easy to fix by changing the signature of handleAsync to not pass the responseWriter and errorWriter. Instead those are created inside handleAsync. But didn't look into it in detail. Reusing requestReader is probably ok.

I'm approving this anyway. So you can merge this if you think the above solution does not work or is too much work for a fast fix.

[oleschoenburg]

👍 At first I didn't want to do this because that meant that the command api and others would also have to pay the cost of creating new readers and writers for every request but now I think I found a nice solution: #10026