Backport of drainer: fix codec race condition in integration test into release/1.3.x #16851
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Backport
This PR is auto-generated from #16845 to be assessed for backporting due to the inclusion of the label backport/1.3.x.
The below text is copied from the body of the original PR.
While working on #14348 I encountered corruption in the RPC decoding in the drainer integration test.
msgpackrpc codec handles are specific to a connection and cannot be shared between goroutines; this can cause corrupted decoding. Fix the drainer integration test so that we create separate codecs for the goroutines that the test helper spins up to simulate client updates.
This changeset also refactors the drainer integration test to bring it up to current idioms and library usages, make assertions more clear, and reduce duplication. I'm backporting this work for consistency between release branches but there's no changelog because this is a test-only PR.