Fix context leaks in existing tests

Nobody has claimed this yet.

This is a tracking issue to fix context leaks in existing tests for all instrumentations that currently have to disable the strict context check.

TODO:

hystrix-1.4/javaagent #14922
kotlinx-coroutines/javaagent #14923
rxjava-3.0/library #14924
rxjava-3.1/library #14924
zio-2.0/javaagent

Completed:

aws-sdk-1.11/javaagent-unit-tests #4366
akka-http-10.0/javaagent #13472
elasticsearch-transport-6.0/javaagent #4282
finatra-2.9/javaagent #4282
grpc-1.6/javaagent #4282
kubernetes-client-7.0/javaagent #3945
mongo-4.0/javaagent #4364
okhttp-3.0/javaagent #3925
play-ws-2.0/javaagent #4365
play-ws-2.1/javaagent #4365
play-2.6/javaagent #4282
pekko-http-1.0/javaagent #13435
reactor-netty-0.9/javaagent #4282
reactor-netty-1.0/javaagent #4282
ratpack-1.4/javaagent #4367
rxjava-2.0/javaagent #4282
rxjava-2.0/library #4282
rxjava-3.0/javaagent #4282
scala-executors/javaagent #4282
servlet-5.0/javaagent #3923
tomcat-10.0/javaagent #3923

Start with the zio-2.0/javaagent entry in the TODO and inspect its existing tests for the strict context check. Run the relevant test suite and identify the context leaks that require the check to be disabled. Done means the zio tests no longer need that exception and the full affected test suite passes.

Written by the indexing model from the issue text.

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