test: improve test-gc-http-client-connaborted
test-gc-http-client-connaborted is resource-intensive. It times out a lot on CI. Move to sequential.
Labeling fast-track to fix flaky CI and because this is awfully easy to undo if someone comes up with a better solution. Please
(No Fixes:
metadata on this one!)
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
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