http: align OutgoingMessage and ClientRequest destroy
Added .destroyed property to OutgoingMessage and ClientRequest to align with streams.
Fixed ClientRequest.destroy to dump res and re-use socket in agent pool aligning it with abort.
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
documentation is changed or added -
commit message follows commit guidelines