test: fix sequential/test-performance delay
This should resolve the flakiness on this test on slower systems where the inited time we store in JS can be much later than the nodeTiming one.
Fixes: https://github.com/nodejs/node/issues/23291
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
commit message follows commit guidelines