test: refactor two http client timeout tests
Refactor test-http-client-set-timeout and test-http-client-timeout-option-with-agent.
Checklist
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make -j4 test(UNIX), orvcbuild test(Windows) passes -
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Refactor test-http-client-set-timeout and test-http-client-timeout-option-with-agent.
make -j4 test (UNIX), or vcbuild test (Windows) passes