Backport of events: Allow subscribing to events in namespaces into release/1.13.x #19137
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Backport
This PR is auto-generated from #19134 to be assessed for backporting due to the inclusion of the label backport/1.13.x.
The below text is copied from the body of the original PR.
Moves handling logic a bit further down the stack to allow us to dynamically hijack requests based on the context's namespace. Should be pretty close to a noop unless the experiment is enabled.
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