test: refactor test-http-client-timeout-option-with-agent
- Switch from Date.now() to process.hrtime.bigint().
- Move start time recording to before the request is created, not after.
Fixes: https://github.com/nodejs/node/issues/25746
@devsnek @nodejs/http @nodejs/testing
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
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